Non-building checkpoint in MAJOR refactor.

Perspex.Base/Binding.cs

@@ -0,0 +1,66 @@
+// -----------------------------------------------------------------------
+// <copyright file="Binding.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    public enum BindingMode
+    {
+        Default,
+        OneWay,
+        TwoWay,
+        OneTime,
+        OneWayToSource,
+    }
+
+    public struct Binding
+    {
+        public BindingMode Mode
+        {
+            get;
+            set;
+        }
+
+        public BindingPriority Priority
+        {
+            get;
+            set;
+        }
+
+        public PerspexProperty Property
+        {
+            get;
+            set;
+        }
+
+        public PerspexObject Source
+        {
+            get;
+            set;
+        }
+
+        public static Binding operator !(Binding binding)
+        {
+            return binding.WithMode(BindingMode.TwoWay);
+        }
+
+        public static Binding operator ~(Binding binding)
+        {
+            return binding.WithMode(BindingMode.TwoWay);
+        }
+
+        public Binding WithMode(BindingMode mode)
+        {
+            this.Mode = mode;
+            return this;
+        }
+
+        public Binding WithPriority(BindingPriority priority)
+        {
+            this.Priority = priority;
+            return this;
+        }
+    }
+}

Perspex.Base/Contract.cs

@@ -0,0 +1,23 @@
+// -----------------------------------------------------------------------
+// <copyright file="Contract.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    using System;
+
+    public static class Contract
+    {
+        public static void Requires<TException>(bool condition) where TException : Exception, new()
+        {
+#if DEBUG
+            if (!condition)
+            {
+                throw new TException();
+            }
+#endif
+        }
+    }
+}

Perspex.Base/IDescription.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IDescription.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    public interface IDescription
+    {
+        string Description { get; }
+    }
+}

Perspex.Base/IObservableDescription.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IObservableDescription.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    public interface IObservableDescription
+    {
+        string Description { get; }
+    }
+}

Perspex.Base/Perspex.Base.csproj

@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{B09B78D8-9B26-48B0-9149-D64A2F120F3F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Perspex</RootNamespace>
+    <AssemblyName>Perspex.Base</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile7</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Binding.cs" />
+    <Compile Include="Contract.cs" />
+    <Compile Include="IDescription.cs" />
+    <Compile Include="IObservableDescription.cs" />
+    <Compile Include="PerspexList.cs" />
+    <Compile Include="PerspexObject.cs" />
+    <Compile Include="PerspexProperty.cs" />
+    <Compile Include="PerspexPropertyChangedEventArgs.cs" />
+    <Compile Include="Platform\IPlatformThreadingInterface.cs" />
+    <Compile Include="PriorityValue.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Threading\Dispatcher.cs" />
+    <Compile Include="Threading\DispatcherFrame.cs" />
+    <Compile Include="Threading\DispatcherOperation.cs" />
+    <Compile Include="Threading\DispatcherTimer.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="Splat">
+      <HintPath>..\packages\Splat.1.3.3\lib\Portable-net45+win+wpa81+wp80\Splat.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Core">
+      <HintPath>..\packages\Rx-Core.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>..\packages\Rx-Interfaces.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Linq">
+      <HintPath>..\packages\Rx-Linq.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Linq.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <Import Project="..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets" Condition="Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets'))" />
+  </Target>
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Perspex.Base/PerspexList.cs

@@ -0,0 +1,50 @@
+// -----------------------------------------------------------------------
+// <copyright file="PerspexList.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using System.Collections.Specialized;
+    using System.Reactive.Linq;
+
+    public class PerspexList<T> : ObservableCollection<T>
+    {
+        public PerspexList()
+        {
+            this.Initialize();
+        }
+
+        public PerspexList(IEnumerable<T> items)
+            : base(items)
+        {
+            this.Initialize();
+        }
+
+        public IObservable<NotifyCollectionChangedEventArgs> Changed
+        {
+            get;
+            private set;
+        }
+
+        public void AddRange(IEnumerable<T> items)
+        {
+            foreach (T item in items)
+            {
+                this.Add(item);
+            }
+        }
+
+        private void Initialize()
+        {
+            this.Changed = Observable.FromEvent<NotifyCollectionChangedEventHandler, NotifyCollectionChangedEventArgs>(
+                handler => (sender, e) => handler(e),
+                handler => this.CollectionChanged += handler,
+                handler => this.CollectionChanged -= handler);
+        }
+    }
+}

Perspex.Base/PerspexObject.cs

@@ -0,0 +1,646 @@
+// -----------------------------------------------------------------------
+// <copyright file="PerspexObject.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using System.Reflection;
+    using Splat;
+
+
+    /// <summary>
+    /// The priority of a binding.
+    /// </summary>
+    public enum BindingPriority
+    {
+        /// <summary>
+        /// A local value.
+        /// </summary>
+        LocalValue,
+
+        /// <summary>
+        /// A triggered style binding.
+        /// </summary>
+        /// <remarks>
+        /// A style trigger is a selector such as .class which overrides a 
+        /// <see cref="TemplatedParent"/> binding. In this way, a basic control can have
+        /// for example a Background from the templated parent which changes when the 
+        /// control has the :pointerover class.
+        /// </remarks>
+        StyleTrigger,
+
+        /// <summary>
+        /// A binding to a property on the templated parent.
+        /// </summary>
+        TemplatedParent,
+
+        /// <summary>
+        /// A style binding.
+        /// </summary>
+        Style,
+
+        /// <summary>
+        /// The binding is uninitialized.
+        /// </summary>
+        Unset = int.MaxValue,
+    }
+
+    /// <summary>
+    /// An object with <see cref="PerspexProperty"/> support.
+    /// </summary>
+    /// <remarks>
+    /// This class is analogous to DependencyObject in WPF.
+    /// </remarks>
+    public class PerspexObject : IEnableLogger
+    {
+        /// <summary>
+        /// The registered properties by type.
+        /// </summary>
+        private static Dictionary<Type, List<PerspexProperty>> registered =
+            new Dictionary<Type, List<PerspexProperty>>();
+
+        /// <summary>
+        /// The parent object that inherited values are inherited from.
+        /// </summary>
+        private PerspexObject inheritanceParent;
+
+        /// <summary>
+        /// The set values/bindings on this object.
+        /// </summary>
+        private Dictionary<PerspexProperty, PriorityValue> values =
+            new Dictionary<PerspexProperty, PriorityValue>();
+
+        /// <summary>
+        /// Raised when a <see cref="PerspexProperty"/> value changes on this object/
+        /// </summary>
+        public event EventHandler<PerspexPropertyChangedEventArgs> PropertyChanged;
+
+        /// <summary>
+        /// Gets or sets the parent object that inherited <see cref="PerspexProperty"/> values 
+        /// are inherited from.
+        /// </summary>
+        protected PerspexObject InheritanceParent
+        {
+            get
+            {
+                return this.inheritanceParent;
+            }
+
+            set
+            {
+                if (this.inheritanceParent != value)
+                {
+                    if (this.inheritanceParent != null)
+                    {
+                        this.inheritanceParent.PropertyChanged -= this.ParentPropertyChanged;
+                    }
+
+                    var inherited = (from property in GetProperties(this.GetType())
+                                     where property.Inherits
+                                     select new
+                                     {
+                                         Property = property,
+                                         Value = this.GetValue(property),
+                                     }).ToList();
+
+                    this.inheritanceParent = value;
+
+                    foreach (var i in inherited)
+                    {
+                        object newValue = this.GetValue(i.Property);
+
+                        if (!object.Equals(i.Value, newValue))
+                        {
+                            this.RaisePropertyChanged(i.Property, i.Value, newValue);
+                        }
+                    }
+
+                    if (this.inheritanceParent != null)
+                    {
+                        this.inheritanceParent.PropertyChanged += this.ParentPropertyChanged;
+                    }
+                }
+            }
+        }
+
+
+        /// <summary>
+        /// Gets or sets the value of a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        public object this[PerspexProperty property]
+        {
+            get { return this.GetValue(property); }
+            set { this.SetValue(property, value); }
+        }
+
+        /// <summary>
+        /// Gets or sets a binding for a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <param name="binding">The binding information.</param>
+        public Binding this[Binding binding]
+        {
+            get
+            {
+                return new Binding
+                {
+                    Mode = binding.Mode,
+                    Priority = binding.Priority,
+                    Property = binding.Property,
+                    Source = this,
+                };
+            }
+
+            set
+            {
+                BindingMode mode = (binding.Mode == BindingMode.Default) ? 
+                    binding.Property.DefaultBindingMode : 
+                    binding.Mode;
+
+                switch (mode)
+                {
+                    case BindingMode.Default:
+                    case BindingMode.OneWay:
+                        this.Bind(binding.Property, value.Source.GetObservable(value.Property), binding.Priority);
+                        break;
+                    case BindingMode.OneTime:
+                        this.SetValue(binding.Property, value.Source.GetValue(value.Property));
+                        break;
+                    case BindingMode.OneWayToSource:
+                        value.Source.Bind(value.Property, this.GetObservable(binding.Property), binding.Priority);
+                        break;
+                    case BindingMode.TwoWay:
+                        this.BindTwoWay(binding.Property, value.Source, value.Property);
+                        break;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets all <see cref="PerspexProperty"/>s registered on a type.
+        /// </summary>
+        /// <param name="type">The type.</param>
+        /// <returns>A collection of <see cref="PerspexProperty"/> definitions.</returns>
+        public static IEnumerable<PerspexProperty> GetProperties(Type type)
+        {
+            Contract.Requires<NullReferenceException>(type != null);
+
+            TypeInfo i = type.GetTypeInfo();
+
+            while (type != null)
+            {
+                List<PerspexProperty> list;
+
+                if (registered.TryGetValue(type, out list))
+                {
+                    foreach (PerspexProperty p in list)
+                    {
+                        yield return p;
+                    }
+                }
+
+                type = type.GetTypeInfo().BaseType;
+            }
+        }
+
+        /// <summary>
+        /// Registers a <see cref="PerspexProperty"/> on a type.
+        /// </summary>
+        /// <param name="type">The type.</param>
+        /// <param name="property">The property.</param>
+        /// <remarks>
+        /// You won't usually want to call this method directly, instead use the 
+        /// <see cref="PerspexProperty.Register"/> method.
+        /// </remarks>
+        public static void Register(Type type, PerspexProperty property)
+        {
+            Contract.Requires<NullReferenceException>(type != null);
+            Contract.Requires<NullReferenceException>(property != null);
+
+            List<PerspexProperty> list;
+
+            if (!registered.TryGetValue(type, out list))
+            {
+                list = new List<PerspexProperty>();
+                registered.Add(type, list);
+            }
+
+            if (!list.Contains(property))
+            {
+                list.Add(property);
+            }
+        }
+
+        /// <summary>
+        /// Clears a <see cref="PerspexProperty"/>'s local value.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        public void ClearValue(PerspexProperty property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+            
+            this.SetValue(property, PerspexProperty.UnsetValue);
+        }
+
+        /// <summary>
+        /// Gets an observable for a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>An observable.</returns>
+        public IObservable<object> GetObservable(PerspexProperty property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            return Observable.Create<object>(observer =>
+            {
+                EventHandler<PerspexPropertyChangedEventArgs> handler = (s, e) =>
+                {
+                    if (e.Property == property)
+                    {
+                        observer.OnNext(e.NewValue);
+                    }
+                };
+
+                this.PropertyChanged += handler;
+                observer.OnNext(this.GetValue(property));
+
+                return () =>
+                {
+                    this.PropertyChanged -= handler;
+                };
+            });
+        }
+
+        /// <summary>
+        /// Gets an observable for a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="property"></param>
+        /// <returns></returns>
+        public IObservable<T> GetObservable<T>(PerspexProperty<T> property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            return this.GetObservable((PerspexProperty)property).Cast<T>();
+        }
+
+        /// <summary>
+        /// Gets an observable for a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="property"></param>
+        /// <returns></returns>
+        public IObservable<Tuple<T, T>> GetObservableWithHistory<T>(PerspexProperty<T> property)
+        {
+            return Observable.Create<Tuple<T, T>>(observer =>
+            {
+                EventHandler<PerspexPropertyChangedEventArgs> handler = (s, e) =>
+                {
+                    if (e.Property == property)
+                    {
+                        observer.OnNext(Tuple.Create((T)e.OldValue, (T)e.NewValue));
+                    }
+                };
+
+                this.PropertyChanged += handler;
+
+                return () =>
+                {
+                    this.PropertyChanged -= handler;
+                };
+            });
+        }
+
+        /// <summary>
+        /// Gets a <see cref="PerspexProperty"/> value.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>The value.</returns>
+        public object GetValue(PerspexProperty property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            object result;
+
+            PriorityValue value;
+
+            if (this.values.TryGetValue(property, out value))
+            {
+                result = value.Value;
+            }
+            else
+            {
+                result = PerspexProperty.UnsetValue;
+            }
+
+            if (result == PerspexProperty.UnsetValue)
+            {
+                result = this.GetDefaultValue(property);
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// Gets a <see cref="PerspexProperty"/> value.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>The value.</returns>
+        public T GetValue<T>(PerspexProperty<T> property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            return (T)this.GetValue((PerspexProperty)property);
+        }
+
+        /// <summary>
+        /// Gets all of the <see cref="PerspexProperty"/> values explicitly set on this object.
+        /// </summary>
+        public IEnumerable<Tuple<PerspexProperty, object, BindingPriority>> GetSetValues()
+        {
+            foreach (var value in this.values)
+            {
+                yield return Tuple.Create(
+                    value.Key,
+                    value.Value.Value,
+                    (BindingPriority)value.Value.ValuePriority);
+            }
+        }
+
+        /// <summary>
+        /// Checks whether a <see cref="PerspexProperty"/> is set on this object.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>True if the property is set, otherwise false.</returns>
+        public bool IsSet(PerspexProperty property)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            return this.values.ContainsKey(property);
+        }
+
+        /// <summary>
+        /// Checks whether a <see cref="PerspexProperty"/> is registered on this class.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>True if the property is registered, otherwise false.</returns>
+        private bool IsRegistered(PerspexProperty property)
+        {
+            Type type = this.GetType();
+
+            while (type != null)
+            {
+                List<PerspexProperty> list;
+
+                if (registered.TryGetValue(type, out list))
+                {
+                    if (list.Contains(property))
+                    {
+                        return true;
+                    }
+                }
+
+                type = type.GetTypeInfo().BaseType;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Sets a <see cref="PerspexProperty"/> value.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <param name="value">The value.</param>
+        public void SetValue(PerspexProperty property, object value)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            const int Priority = (int)BindingPriority.LocalValue;
+            PriorityValue v;
+
+            if (!this.IsRegistered(property))
+            {
+                throw new InvalidOperationException(string.Format(
+                    "Property '{0}' not registered on '{1}'",
+                    property.Name,
+                    this.GetType()));
+            }
+
+            if (!PriorityValue.IsValidValue(value, property.PropertyType))
+            {
+                throw new InvalidOperationException(string.Format(
+                    "Invalid value for Property '{0}': {1} ({2})",
+                    property.Name,
+                    value,
+                    value.GetType().FullName));
+            }
+
+            if (!this.values.TryGetValue(property, out v))
+            {
+                if (value == PerspexProperty.UnsetValue)
+                {
+                    return;
+                }
+
+                v = this.CreatePriorityValue(property);
+                this.values.Add(property, v);
+            }
+
+            this.Log().Debug(string.Format(
+                "Set local value of {0}.{1} (#{2:x8}) to {3}",
+                this.GetType().Name,
+                property.Name,
+                this.GetHashCode(),
+                value));
+
+            v.Replace(Observable.Never<object>().StartWith(value), Priority);
+        }
+
+        /// <summary>
+        /// Sets a <see cref="PerspexProperty"/> value.
+        /// </summary>
+        /// <typeparam name="T">The type of the property.</typeparam>
+        /// <param name="property">The property.</param>
+        /// <param name="value">The value.</param>
+        public void SetValue<T>(PerspexProperty<T> property, T value)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            this.SetValue((PerspexProperty)property, value);
+        }
+
+        /// <summary>
+        /// Binds a <see cref="PerspexProperty"/> to an observable.
+        /// </summary>
+        /// <typeparam name="T">The type of the property.</typeparam>
+        /// <param name="property">The property.</param>
+        /// <param name="source">The observable.</param>
+        /// <param name="priority">The priority of the binding.</param>
+        /// <returns>
+        /// A disposable which can be used to terminate the binding.
+        /// </returns>
+        public IDisposable Bind(
+            PerspexProperty property,
+            IObservable<object> source,
+            BindingPriority priority = BindingPriority.LocalValue)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            PriorityValue v;
+            IDescription description = source as IDescription;
+
+            if (!this.values.TryGetValue(property, out v))
+            {
+                v = this.CreatePriorityValue(property);
+                this.values.Add(property, v);
+            }
+
+            this.Log().Debug(string.Format(
+                "Bound value of {0}.{1} (#{2:x8}) to {3}",
+                this.GetType().Name,
+                property.Name,
+                this.GetHashCode(),
+                description != null ? description.Description : "[Anonymous]"));
+
+            if (priority == BindingPriority.LocalValue)
+            {
+                return v.Replace(source, (int)priority);
+            }
+            else
+            {
+                return v.Add(source, (int)priority);
+            }
+        }
+
+        /// <summary>
+        /// Binds a <see cref="PerspexProperty"/> to an observable.
+        /// </summary>
+        /// <typeparam name="T">The type of the property.</typeparam>
+        /// <param name="property">The property.</param>
+        /// <param name="source">The observable.</param>
+        /// <param name="priority">The priority of the binding.</param>
+        /// <returns>
+        /// A disposable which can be used to terminate the binding.
+        /// </returns>
+        public IDisposable Bind<T>(
+            PerspexProperty<T> property, 
+            IObservable<T> source, 
+            BindingPriority priority = BindingPriority.LocalValue)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            return this.Bind((PerspexProperty)property, (IObservable<object>)source, priority);
+        }
+
+        /// <summary>
+        /// Initialites a two-way bind between <see cref="PerspexProperty"/>s.
+        /// </summary>
+        /// <param name="property">The property on this object.</param>
+        /// <param name="source">The source object.</param>
+        /// <param name="sourceProperty">The property on the source object.</param>
+        /// <returns>
+        /// A disposable which can be used to terminate the binding.
+        /// </returns>
+        /// <remarks>
+        /// The binding is first carried out from <paramref name="source"/> to this. Two-way 
+        /// bindings are always at the LocalValue priority.
+        /// </remarks>
+        public void BindTwoWay(
+            PerspexProperty property, 
+            PerspexObject source, 
+            PerspexProperty sourceProperty)
+        {
+            source.GetObservable(sourceProperty).Subscribe(x => this.SetValue(property, x));
+            this.GetObservable(property).Subscribe(x => source.SetValue(sourceProperty, x));
+        }
+
+        private PriorityValue CreatePriorityValue(PerspexProperty property)
+        {
+            PriorityValue result = new PriorityValue(property.Name, property.PropertyType);
+
+            result.Changed.Subscribe(x =>
+            {
+                object oldValue = (x.Item1 == PerspexProperty.UnsetValue) ?
+                    this.GetDefaultValue(property) :
+                    x.Item1;
+                object newValue = (x.Item2 == PerspexProperty.UnsetValue) ?
+                    this.GetDefaultValue(property) :
+                    x.Item2;
+
+                if (!object.Equals(oldValue, newValue))
+                {
+                    this.RaisePropertyChanged(property, oldValue, newValue);
+
+                    this.Log().Debug(string.Format(
+                        "Value of {0}.{1} (#{2:x8}) changed from {3} to {4}",
+                        this.GetType().Name,
+                        property.Name,
+                        this.GetHashCode(),
+                        oldValue,
+                        newValue));
+                }
+            });
+
+            return result;
+        }
+
+        /// <summary>
+        /// Gets the default value for a property.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>The default value.</returns>
+        private object GetDefaultValue(PerspexProperty property)
+        {
+            if (property.Inherits && this.inheritanceParent != null)
+            {
+                return this.inheritanceParent.GetValue(property);
+            }
+            else
+            {
+                return property.GetDefaultValue(this.GetType());
+            }
+        }
+
+        /// <summary>
+        /// Called when a property is changed on the current <see cref="InheritanceParent"/>.
+        /// </summary>
+        /// <param name="sender">The event sender.</param>
+        /// <param name="e">The event args.</param>
+        /// <remarks>
+        /// Checks for changes in an inherited property value.
+        /// </remarks>
+        private void ParentPropertyChanged(object sender, PerspexPropertyChangedEventArgs e)
+        {
+            Contract.Requires<ArgumentNullException>(e != null);
+
+            if (e.Property.Inherits && !this.IsSet(e.Property))
+            {
+                this.RaisePropertyChanged(e.Property, e.OldValue, e.NewValue);
+            }
+        }
+
+        /// <summary>
+        /// Raises the <see cref="PropertyChanged"/> event.
+        /// </summary>
+        /// <param name="property">The property that has changed.</param>
+        /// <param name="oldValue">The old property value.</param>
+        /// <param name="newValue">The new property value.</param>
+        private void RaisePropertyChanged(PerspexProperty property, object oldValue, object newValue)
+        {
+            Contract.Requires<NullReferenceException>(property != null);
+
+            if (this.PropertyChanged != null)
+            {
+                PerspexPropertyChangedEventArgs e = new PerspexPropertyChangedEventArgs(this, property, oldValue, newValue);
+                property.NotifyChanged(e);
+                this.PropertyChanged(this, e);
+            }
+        }
+    }
+}

Perspex.Base/PerspexProperty.cs

@@ -0,0 +1,333 @@
+// -----------------------------------------------------------------------
+// <copyright file="PerspexProperty.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reactive.Subjects;
+    using System.Reflection;
+
+    /// <summary>
+    /// A perspex property.
+    /// </summary>
+    /// <remarks>
+    /// This class is analogous to DependencyProperty in WPF.
+    /// </remarks>
+    public class PerspexProperty
+    {
+        /// <summary>
+        /// Represents an unset property value.
+        /// </summary>
+        public static readonly object UnsetValue = new Unset();
+
+        /// <summary>
+        /// The default values for the property, by type.
+        /// </summary>
+        private Dictionary<Type, object> defaultValues = new Dictionary<Type, object>();
+
+        /// <summary>
+        /// Observable fired when this property changes on any <see cref="PerspexObject"/>.
+        /// </summary>
+        private Subject<PerspexPropertyChangedEventArgs> changed = new Subject<PerspexPropertyChangedEventArgs>();
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PerspexProperty"/> class.
+        /// </summary>
+        /// <param name="name">The name of the property.</param>
+        /// <param name="valueType">The type of the property's value.</param>
+        /// <param name="ownerType">The type of the class that registers the property.</param>
+        /// <param name="defaultValue">The default value of the property.</param>
+        /// <param name="inherits">Whether the property inherits its value.</param>
+        /// <param name="defaultBindingMode">The default binding mode for the property.</param>
+        public PerspexProperty(
+            string name,
+            Type valueType,
+            Type ownerType,
+            object defaultValue,
+            bool inherits,
+            BindingMode defaultBindingMode)
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+            Contract.Requires<NullReferenceException>(valueType != null);
+            Contract.Requires<NullReferenceException>(ownerType != null);
+
+            this.Name = name;
+            this.PropertyType = valueType;
+            this.OwnerType = ownerType;
+            this.Inherits = inherits;
+            this.DefaultBindingMode = defaultBindingMode;
+            this.defaultValues.Add(ownerType, defaultValue);
+        }
+
+        /// <summary>
+        /// Gets the name of the property.
+        /// </summary>
+        public string Name { get; private set; }
+
+        /// <summary>
+        /// Gets the type of the property's value.
+        /// </summary>
+        public Type PropertyType { get; private set; }
+
+        /// <summary>
+        /// Gets the type of the class that registers the property.
+        /// </summary>
+        public Type OwnerType { get; private set; }
+
+        /// <summary>
+        /// Gets a value indicating whether the property inherits its value.
+        /// </summary>
+        public bool Inherits { get; private set; }
+
+        /// <summary>
+        /// Gets the default binding mode for the property.
+        /// </summary>
+        /// <returns></returns>
+        public BindingMode DefaultBindingMode { get; private set; }
+
+        /// <summary>
+        /// Gets an observable that is fired when this property changes on any 
+        /// <see cref="PerspexObject"/> instance.
+        /// </summary>
+        public IObservable<PerspexPropertyChangedEventArgs> Changed
+        {
+            get { return this.changed; }
+        }
+
+        /// <summary>
+        /// Registers a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <typeparam name="TOwner">The type of the class that is registering the property.</typeparam>
+        /// <typeparam name="TValue">The type of the property's value.</typeparam>
+        /// <param name="name">The name of the property.</param>
+        /// <param name="defaultValue">The default value of the property.</param>
+        /// <param name="inherits">Whether the property inherits its value.</param>
+        /// <param name="defaultBindingMode">The default binding mode for the property.</param>
+        /// <returns>A <see cref="PerspexProperty{TValue}"/></returns>
+        public static PerspexProperty<TValue> Register<TOwner, TValue>(
+            string name,
+            TValue defaultValue = default(TValue),
+            bool inherits = false,
+            BindingMode defaultBindingMode = BindingMode.OneWay)
+            where TOwner : PerspexObject
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+
+            PerspexProperty<TValue> result = new PerspexProperty<TValue>(
+                name,
+                typeof(TOwner),
+                defaultValue,
+                inherits,
+                defaultBindingMode);
+
+            PerspexObject.Register(typeof(TOwner), result);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Registers an attached <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <typeparam name="TOwner">The type of the class that is registering the property.</typeparam>
+        /// <typeparam name="THost">The type of the class that the property is to be registered on.</typeparam>
+        /// <typeparam name="TValue">The type of the property's value.</typeparam>
+        /// <param name="name">The name of the property.</param>
+        /// <param name="defaultValue">The default value of the property.</param>
+        /// <param name="inherits">Whether the property inherits its value.</param>
+        /// <param name="defaultBindingMode">The default binding mode for the property.</param>
+        /// <returns>A <see cref="PerspexProperty{TValue}"/></returns>
+        public static PerspexProperty<TValue> RegisterAttached<TOwner, THost, TValue>(
+            string name,
+            TValue defaultValue = default(TValue),
+            bool inherits = false,
+            BindingMode defaultBindingMode = BindingMode.OneWay)
+            where TOwner : PerspexObject
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+
+            PerspexProperty<TValue> result = new PerspexProperty<TValue>(
+                name,
+                typeof(TOwner),
+                defaultValue,
+                inherits,
+                defaultBindingMode);
+
+            PerspexObject.Register(typeof(THost), result);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Provides access to a property's binding via the <see cref="PerspexObject"/> 
+        /// indexer.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>A <see cref="Binding"/> describing the binding.</returns>
+        public static Binding operator!(PerspexProperty property)
+        {
+            return new Binding
+            {
+                Priority = BindingPriority.LocalValue,
+                Property = property,
+            };
+        }
+
+        /// <summary>
+        /// Provides access to a property's template binding via the <see cref="PerspexObject"/>
+        /// indexer.
+        /// </summary>
+        /// <param name="property">The property.</param>
+        /// <returns>A <see cref="Binding"/> describing the binding.</returns>
+        public static Binding operator ~(PerspexProperty property)
+        {
+            return new Binding
+            {
+                Priority = BindingPriority.TemplatedParent,
+                Property = property,
+            };
+        }
+
+        /// <summary>
+        /// Returns a binding accessor that can be passed to <see cref="PerspexObject"/>'s [] 
+        /// operator to initiate a binding.
+        /// </summary>
+        /// <returns>A <see cref="Binding"/>.</returns>
+        /// <remarks>
+        /// The ! and ~ operators are short forms of this.
+        /// </remarks>
+        public Binding Bind()
+        {
+            return new Binding
+            {
+                Property = this,
+            };
+        }
+
+        /// <summary>
+        /// Gets the default value for the property on the specified type.
+        /// </summary>
+        /// <param name="type">The type.</param>
+        /// <returns>The default value.</returns>
+        public object GetDefaultValue(Type type)
+        {
+            Contract.Requires<NullReferenceException>(type != null);
+
+            while (type != null)
+            {
+                object result;
+
+                if (this.defaultValues.TryGetValue(type, out result))
+                {
+                    return result;
+                }
+
+                type = type.GetTypeInfo().BaseType;
+            }
+
+            return this.defaultValues[this.OwnerType];
+        }
+
+        public bool IsValidValue(object value)
+        {
+            if (value == UnsetValue)
+            {
+                return true;
+            }
+            else if (value == null)
+            {
+                return !this.PropertyType.GetTypeInfo().IsValueType ||
+                    Nullable.GetUnderlyingType(this.PropertyType) != null;
+            }
+
+            return this.PropertyType.GetTypeInfo().IsAssignableFrom(value.GetType().GetTypeInfo());
+        }
+
+        /// <summary>
+        /// Gets the default value for the property on the specified type.
+        /// </summary>
+        /// <param name="type">The type.</param>
+        /// <param name="defaultValue">The default value.</param>
+        public void OverrideDefaultValue(Type type, object defaultValue)
+        {
+            Contract.Requires<NullReferenceException>(type != null);
+
+            // TODO: Ensure correct type.
+
+            if (this.defaultValues.ContainsKey(type))
+            {
+                throw new InvalidOperationException("Default value is already set for this property.");
+            }
+
+            this.defaultValues.Add(type, defaultValue);
+        }
+
+        public override string ToString()
+        {
+            return this.Name;
+        }
+
+        internal void NotifyChanged(PerspexPropertyChangedEventArgs e)
+        {
+            this.changed.OnNext(e);
+        }
+
+        private class Unset
+        {
+            public override string ToString()
+            {
+                return "{Unset}";
+            }
+        }
+    }
+
+    /// <summary>
+    /// A typed perspex property.
+    /// </summary>
+    public class PerspexProperty<TValue> : PerspexProperty
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PerspexProperty"/> class.
+        /// </summary>
+        /// <param name="name">The name of the property.</param>
+        /// <param name="ownerType">The type of the class that registers the property.</param>
+        /// <param name="defaultValue">The default value of the property.</param>
+        /// <param name="inherits">Whether the property inherits its value.</param>
+        /// <param name="defaultBindingMode">The default binding mode for the property.</param>
+        public PerspexProperty(
+            string name,
+            Type ownerType,
+            TValue defaultValue,
+            bool inherits,
+            BindingMode defaultBindingMode)
+            : base(name, typeof(TValue), ownerType, defaultValue, inherits, defaultBindingMode)
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+            Contract.Requires<NullReferenceException>(ownerType != null);
+        }
+
+        /// <summary>
+        /// Registers the property on another type.
+        /// </summary>
+        /// <typeparam name="TOwner">The type of the additional owner.</typeparam>
+        /// <returns>The property.</returns>
+        public PerspexProperty<TValue> AddOwner<TOwner>()
+        {
+            PerspexObject.Register(typeof(TOwner), this);
+            return this;
+        }
+
+        /// <summary>
+        /// Gets the default value for the property on the specified type.
+        /// </summary>
+        /// <typeparam name="T">The type.</typeparam>
+        /// <returns>The default value.</returns>
+        public TValue GetDefaultValue<T>()
+        {
+            return (TValue)this.GetDefaultValue(typeof(T));
+        }
+    }
+}

Perspex.Base/PerspexPropertyChangedEventArgs.cs

@@ -0,0 +1,47 @@
+// -----------------------------------------------------------------------
+// <copyright file="PerspexPropertyChangedEventArgs.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    /// <summary>
+    /// Provides information for a perspex property change.
+    /// </summary>
+    public class PerspexPropertyChangedEventArgs
+    {
+        public PerspexPropertyChangedEventArgs(
+            PerspexObject sender,
+            PerspexProperty property,
+            object oldValue,
+            object newValue)
+        {
+            this.Sender = sender;
+            this.Property = property;
+            this.OldValue = oldValue;
+            this.NewValue = newValue;
+        }
+
+        /// <summary>
+        /// Gets the <see cref="PerspexObject"/> that the property changed on.
+        /// </summary>
+        /// <returns></returns>
+        public PerspexObject Sender { get; private set; }
+
+        /// <summary>
+        /// Gets the property that changed.
+        /// </summary>
+        public PerspexProperty Property { get; private set; }
+
+        /// <summary>
+        /// Gets the old value of the property.
+        /// </summary>
+        public object OldValue { get; private set; }
+
+        /// <summary>
+        /// Gets the new value of the property.
+        /// </summary>
+        public object NewValue { get; private set; }
+    }
+}

Perspex.Base/Platform/IPlatformThreadingInterface.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="IPlatformThreadingInterface.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Platform
+{
+    using System;
+    using Perspex.Threading;
+
+    public interface IPlatformThreadingInterface
+    {
+        Dispatcher GetThreadDispatcher();
+
+        void KillTimer(object timerHandle);
+
+        object StartTimer(TimeSpan interval, Action internalTick);
+    }
+}

Perspex.Base/PriorityValue.cs

@@ -0,0 +1,405 @@
+// -----------------------------------------------------------------------
+// <copyright file="PriorityValue.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reactive.Disposables;
+    using System.Reactive.Subjects;
+    using System.Reflection;
+
+    /// <summary>
+    /// Maintains a list of prioritised bindings together with a current value.
+    /// </summary>
+    /// <remarks>
+    /// Bindings, in the form of <see cref="IObservable<object>"/>s are added to the object using
+    /// the <see cref="Add"/> method. With the observable is passed a priority, where lower values
+    /// represent higher priorites. The current <see cref="Value"/> is selected from the highest
+    /// priority binding that doesn't return <see cref="PerspexProperty.UnsetValue"/>. Where there
+    /// are multiple bindings registered with the same priority, the most recently added binding
+    /// has a higher priority. Each time the value changes to a distinct new value, the
+    /// <see cref="Changed"/> observable is fired with the old and new values.
+    /// </remarks>
+    public class PriorityValue
+    {
+        /// <summary>
+        /// The name of the property.
+        /// </summary>
+        private string name;
+
+        /// <summary>
+        /// The value type.
+        /// </summary>
+        private Type valueType;
+
+        /// <summary>
+        /// The currently registered binding entries.
+        /// </summary>
+        private LinkedList<BindingEntry> bindings = new LinkedList<BindingEntry>();
+
+        /// <summary>
+        /// The changed observable.
+        /// </summary>
+        private Subject<Tuple<object, object>> changed = new Subject<Tuple<object, object>>();
+
+        /// <summary>
+        /// The current value.
+        /// </summary>
+        private object value;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PriorityValue"/> class.
+        /// </summary>
+        /// <param name="name">The name of the property.</param>
+        /// <param name="valueType">The value type.</param>
+        public PriorityValue(string name, Type valueType)
+        {
+            this.name = name;
+            this.valueType = valueType;
+            this.value = PerspexProperty.UnsetValue;
+            this.ValuePriority = int.MaxValue;
+        }
+
+        /// <summary>
+        /// Fired whenever the current <see cref="Value"/> changes to a new distinct value.
+        /// </summary>
+        public IObservable<Tuple<object, object>> Changed
+        {
+            get { return this.changed; }
+        }
+
+        /// <summary>
+        /// Gets the current value.
+        /// </summary>
+        public object Value
+        {
+            get { return this.value; }
+        }
+
+        /// <summary>
+        /// Gets the priority of the binding that is currently active.
+        /// </summary>
+        public int ValuePriority
+        {
+            get;
+            private set;
+        }
+
+        /// <summary>
+        /// Checks whether a value is valid for a type.
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="propertyType"></param>
+        /// <returns></returns>
+        public static bool IsValidValue(object value, Type propertyType)
+        {
+            TypeInfo type = propertyType.GetTypeInfo();
+
+            if (value == PerspexProperty.UnsetValue)
+            {
+                return true;
+            }
+            else if (value == null)
+            {
+                if (type.IsValueType && 
+                    (!type.IsGenericType || !(type.GetGenericTypeDefinition() == typeof(Nullable<>))))
+                {
+                    return false;
+                }
+            }
+            else
+            {
+                if (!type.IsAssignableFrom(value.GetType().GetTypeInfo()))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Adds a new binding.
+        /// </summary>
+        /// <param name="binding">The binding.</param>
+        /// <param name="priority">The binding priority.</param>
+        /// <returns>
+        /// A disposable that will remove the binding.
+        /// </returns>
+        public IDisposable Add(IObservable<object> binding, int priority)
+        {
+            BindingEntry entry = new BindingEntry();
+            LinkedListNode<BindingEntry> insert = this.bindings.First;
+
+            while (insert != null && insert.Value.Priority < priority)
+            {
+                insert = insert.Next;
+            }
+
+            if (insert == null)
+            {
+                this.bindings.AddLast(entry);
+            }
+            else
+            {
+                this.bindings.AddBefore(insert, entry);
+            }
+
+            entry.Start(binding, priority, this.EntryChanged, this.EntryCompleted);
+
+            return Disposable.Create(() =>
+            {
+                this.Remove(entry);
+            });
+        }
+
+        /// <summary>
+        /// Adds a new binding, replacing all those of the same priority.
+        /// </summary>
+        /// <param name="binding">The binding.</param>
+        /// <param name="priority">The binding priority.</param>
+        /// <returns>
+        /// A disposable that will remove the binding.
+        /// </returns>
+        public IDisposable Replace(IObservable<object> binding, int priority)
+        {
+            BindingEntry entry = new BindingEntry();
+            LinkedListNode<BindingEntry> insert = this.bindings.First;
+
+            while (insert != null && insert.Value.Priority < priority)
+            {
+                insert = insert.Next;
+            }
+
+            while (insert != null && insert.Value.Priority == priority)
+            {
+                LinkedListNode<BindingEntry> next = insert.Next;
+                insert.Value.Dispose();
+                this.bindings.Remove(insert);
+                insert = next;
+            }
+
+            if (insert == null)
+            {
+                this.bindings.AddLast(entry);
+            }
+            else
+            {
+                this.bindings.AddBefore(insert, entry);
+            }
+
+            entry.Start(binding, priority, this.EntryChanged, this.EntryCompleted);
+
+            return Disposable.Create(() =>
+            {
+                this.Remove(entry);
+            });
+        }
+
+        /// <summary>
+        /// Removes all bindings with the specified priority.
+        /// </summary>
+        /// <param name="priority">The priority.</param>
+        public void Clear(int priority)
+        {
+            LinkedListNode<BindingEntry> item = this.bindings.First;
+            bool removed = false;
+
+            while (item != null && item.Value.Priority <= priority)
+            {
+                LinkedListNode<BindingEntry> next = item.Next;
+
+                if (item.Value.Priority == priority)
+                {
+                    item.Value.Dispose();
+                    this.bindings.Remove(item);
+                    removed = true;
+                }
+
+                item = next;
+            }
+
+            if (removed && priority <= this.ValuePriority)
+            {
+                this.UpdateValue();
+            }
+        }
+
+        /// <summary>
+        /// Gets the currently active bindings on this object.
+        /// </summary>
+        /// <returns>An enumerable collection of bindings.</returns>
+        public IEnumerable<BindingEntry> GetBindings()
+        {
+            return this.bindings;
+        }
+
+        /// <summary>
+        /// Called when a binding's value changes.
+        /// </summary>
+        /// <param name="changed">The changed entry.</param>
+        private void EntryChanged(BindingEntry changed)
+        {
+            if (changed.Priority <= this.ValuePriority)
+            {
+                this.UpdateValue();
+            }
+        }
+
+        /// <summary>
+        /// Called when a binding completes.
+        /// </summary>
+        /// <param name="changed">The completed entry.</param>
+        private void EntryCompleted(BindingEntry entry)
+        {
+            this.Remove(entry);
+        }
+
+        /// <summary>
+        /// Sets the current value and notifies all observers.
+        /// </summary>
+        /// <param name="value">The new value.</param>
+        /// <param name="priority">The priority of the binding which produced the value.</param>
+        private void SetValue(object value, int priority)
+        {
+            if (!IsValidValue(value, this.valueType))
+            {
+                throw new InvalidOperationException(string.Format(
+                    "Invalid value for Property '{0}': {1} ({2})",
+                    this.name,
+                    value,
+                    value.GetType().FullName));
+            }
+
+            object old = this.value;
+
+            this.ValuePriority = priority;
+
+            if (!EqualityComparer<object>.Default.Equals(old, value))
+            {
+                this.value = value;
+                this.changed.OnNext(Tuple.Create(old, value));
+            }
+        }
+
+        /// <summary>
+        /// Removes the specified binding entry and updates the current value.
+        /// </summary>
+        /// <param name="entry">The binding entry to remove.</param>
+        private void Remove(BindingEntry entry)
+        {
+            entry.Dispose();
+            this.bindings.Remove(entry);
+            this.UpdateValue();
+        }
+
+        /// <summary>
+        /// Updates the current value.
+        /// </summary>
+        private void UpdateValue()
+        {
+            foreach (BindingEntry entry in this.bindings)
+            {
+                if (entry.Value != PerspexProperty.UnsetValue)
+                {
+                    this.SetValue(entry.Value, entry.Priority);
+                    return;
+                }
+            }
+
+            this.SetValue(PerspexProperty.UnsetValue, int.MaxValue);
+        }
+
+        /// <summary>
+        /// A registered binding.
+        /// </summary>
+        public class BindingEntry : IDisposable
+        {
+            /// <summary>
+            /// The binding subscription.
+            /// </summary>
+            private IDisposable subscription;
+
+            /// <summary>
+            /// Gets a description of the binding.
+            /// </summary>
+            public string Description
+            {
+                get;
+                private set;
+            }
+
+            /// <summary>
+            /// The priority of the binding.
+            /// </summary>
+            public int Priority
+            {
+                get;
+                private set;
+            }
+
+            /// <summary>
+            /// The current value of the binding.
+            /// </summary>
+            public object Value
+            {
+                get;
+                private set;
+            }
+
+            /// <summary>
+            /// Starts listening to the specified binding.
+            /// </summary>
+            /// <param name="binding">The binding.</param>
+            /// <param name="priority">The binding priority.</param>
+            /// <param name="changed">Called when the binding changes.</param>
+            /// <param name="completed">Called when the binding completes.</param>
+            public void Start(
+                IObservable<object> binding,
+                int priority,
+                Action<BindingEntry> changed,
+                Action<BindingEntry> completed)
+            {
+                Contract.Requires<ArgumentNullException>(binding != null);
+                Contract.Requires<ArgumentNullException>(changed != null);
+                Contract.Requires<ArgumentNullException>(completed != null);
+
+                if (this.subscription != null)
+                {
+                    throw new Exception("PriorityValue.Entry.Start() called more than once.");
+                }
+
+                this.Priority = priority;
+                this.Value = PerspexProperty.UnsetValue;
+
+                if (binding is IDescription)
+                {
+                    this.Description = ((IDescription)binding).Description;
+                }
+
+                this.subscription = binding.Subscribe(
+                    value =>
+                    {
+                        this.Value = value;
+                        changed(this);
+                    },
+                    () => completed(this));
+            }
+
+            /// <summary>
+            /// Ends the binding subscription.
+            /// </summary>
+            public void Dispose()
+            {
+                if (this.subscription != null)
+                {
+                    this.subscription.Dispose();
+                }
+            }
+        }
+    }
+}

Perspex.Base/Properties/AssemblyInfo.cs

@@ -0,0 +1,30 @@
+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Perspex.Base")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Perspex.Base")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Perspex.Base/Threading/Dispatcher.cs

@@ -0,0 +1,102 @@
+// -----------------------------------------------------------------------
+// <copyright file="Dispatcher.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Threading
+{
+    using System;
+    using System.Collections.Generic;
+    using System.ComponentModel;
+    using System.Security;
+    using System.Threading;
+    using Perspex.Platform;
+    using Splat;
+
+    public enum DispatcherPriority
+    {
+        Invalid = -1,
+        Inactive = 0,
+        SystemIdle = 1,
+        ApplicationIdle = 2,
+        ContextIdle = 3,
+        Background = 4,
+        Input = 5,
+        Loaded = 6,
+        Render = 7,
+        DataBind = 8,
+        Normal = 9,
+        Send = 10,
+    }
+
+    [Flags]
+    internal enum Flags
+    {
+        ShutdownStarted = 1,
+        Shutdown = 2,
+        Disabled = 4
+    }
+
+    public abstract class Dispatcher
+    {
+        private static DispatcherFrame mainExecutionFrame = new DispatcherFrame();
+
+        public static Dispatcher CurrentDispatcher
+        {
+            get { return Locator.Current.GetService<IPlatformThreadingInterface>().GetThreadDispatcher(); }
+        }
+
+        public abstract bool HasShutdownFinished
+        {
+            get;
+        }
+
+        public abstract DispatcherFrame CurrentFrame
+        {
+            get;
+            set;
+        }
+
+        public static void PushFrame(DispatcherFrame frame)
+        {
+            if (frame == null)
+            {
+                throw new ArgumentNullException("frame");
+            }
+
+            Dispatcher dis = CurrentDispatcher;
+
+            if (dis.HasShutdownFinished)
+            {
+                throw new InvalidOperationException("The Dispatcher has shut down");
+            }
+
+            if (frame.Running != null)
+            {
+                throw new InvalidOperationException("Frame is already running on a different dispatcher");
+            }
+
+            frame.ParentFrame = dis.CurrentFrame;
+            dis.CurrentFrame = frame;
+
+            frame.Running = dis;
+
+            dis.RunFrame(frame);
+        }
+
+
+        public static void Run()
+        {
+            PushFrame(mainExecutionFrame);
+        }
+
+        public abstract DispatcherOperation BeginInvoke(Action method);
+
+        public abstract DispatcherOperation BeginInvoke(DispatcherPriority priority, Action method);
+
+        protected internal abstract void Reprioritize(DispatcherOperation op, DispatcherPriority oldpriority);
+
+        protected abstract void RunFrame(DispatcherFrame frame);
+    }
+}

Perspex.Base/Threading/DispatcherFrame.cs

@@ -0,0 +1,25 @@
+// -----------------------------------------------------------------------
+// <copyright file="DispatcherFrame.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Threading
+{
+    public class DispatcherFrame
+    {
+        public DispatcherFrame()
+        {
+            this.Continue = true;
+            this.ExitOnRequest = true;
+        }
+
+        public bool Continue { get; set; }
+
+        public bool ExitOnRequest { get; set; }
+
+        public Dispatcher Running { get; set; }
+
+        public DispatcherFrame ParentFrame { get; set; }
+    }
+}

Perspex.Base/Threading/DispatcherOperation.cs

@@ -0,0 +1,159 @@
+// -----------------------------------------------------------------------
+// <copyright file="DispatcherOperation.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Threading
+{
+    using System;
+    using System.Security;
+
+    public enum DispatcherOperationStatus
+    {
+        Pending = 0,
+        Aborted = 1,
+        Completed = 2,
+        Executing = 3
+    }
+
+    public sealed class DispatcherOperation
+    {
+        private DispatcherOperationStatus status;
+        private DispatcherPriority priority;
+        private Dispatcher dispatcher;
+        private object result;
+        private Delegate delegateMethod;
+        private object[] delegateArgs;
+
+        public DispatcherOperation(Dispatcher dis, DispatcherPriority prio)
+        {
+            this.dispatcher = dis;
+            this.priority = prio;
+            if (this.Dispatcher.HasShutdownFinished)
+            {
+                this.status = DispatcherOperationStatus.Aborted;
+            }
+            else
+            {
+                this.status = DispatcherOperationStatus.Pending;
+            }
+        }
+
+        public DispatcherOperation(Dispatcher dis, DispatcherPriority prio, Delegate d)
+            : this(dis, prio)
+        {
+            this.delegateMethod = d;
+        }
+
+        public DispatcherOperation(Dispatcher dis, DispatcherPriority prio, Delegate d, object arg)
+            : this(dis, prio)
+        {
+            this.delegateMethod = d;
+            this.delegateArgs = new object[1];
+            this.delegateArgs[0] = arg;
+        }
+
+        public DispatcherOperation(Dispatcher dis, DispatcherPriority prio, Delegate d, object arg, object[] args)
+            : this(dis, prio)
+        {
+            this.delegateMethod = d;
+            this.delegateArgs = new object[args.Length + 1];
+            this.delegateArgs[0] = arg;
+            Array.Copy(args, 1, this.delegateArgs, 0, args.Length);
+        }
+
+        public event EventHandler Completed;
+
+        public DispatcherOperationStatus Status
+        {
+            get
+            {
+                return this.status;
+            }
+
+            internal set
+            {
+                this.status = value;
+            }
+        }
+
+        public Dispatcher Dispatcher
+        {
+            get
+            {
+                return this.dispatcher;
+            }
+        }
+
+        public DispatcherPriority Priority
+        {
+            get
+            {
+                return this.priority;
+            }
+
+            set
+            {
+                if (this.priority != value)
+                {
+                    DispatcherPriority old = this.priority;
+                    this.priority = value;
+                    this.dispatcher.Reprioritize(this, old);
+                }
+            }
+        }
+
+        public object Result
+        {
+            get
+            {
+                return this.result;
+            }
+        }
+
+        public bool Abort()
+        {
+            this.status = DispatcherOperationStatus.Aborted;
+            throw new NotImplementedException();
+        }
+
+        public DispatcherOperationStatus Wait()
+        {
+            if (this.status == DispatcherOperationStatus.Executing)
+            {
+                throw new InvalidOperationException("Already executing");
+            }
+
+            throw new NotImplementedException();
+        }
+
+        [SecurityCritical]
+        public DispatcherOperationStatus Wait(TimeSpan timeout)
+        {
+            if (this.status == DispatcherOperationStatus.Executing)
+            {
+                throw new InvalidOperationException("Already executing");
+            }
+
+            throw new NotImplementedException();
+        }
+
+        public void Invoke()
+        {
+            this.status = DispatcherOperationStatus.Executing;
+
+            if (this.delegateMethod != null)
+            {
+                this.result = this.delegateMethod.DynamicInvoke(this.delegateArgs);
+            }
+
+            this.status = DispatcherOperationStatus.Completed;
+
+            if (this.Completed != null)
+            {
+                this.Completed(this, EventArgs.Empty);
+            }
+        }
+    }
+}

Perspex.Base/Threading/DispatcherTimer.cs

@@ -0,0 +1,140 @@
+// -----------------------------------------------------------------------
+// <copyright file="DispatcherTimer.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Threading
+{
+    using System;
+    using Perspex.Platform;
+    using Splat;
+
+    public class DispatcherTimer
+    {
+        private object timerHandle;
+
+        private DispatcherPriority priority;
+
+        private TimeSpan interval;
+
+        public DispatcherTimer()
+        {
+            this.priority = DispatcherPriority.Normal;
+            this.Dispatcher = Dispatcher.CurrentDispatcher;
+        }
+
+        public DispatcherTimer(DispatcherPriority priority)
+        {
+            this.priority = priority;
+            this.Dispatcher = Dispatcher.CurrentDispatcher;
+        }
+
+        public DispatcherTimer(DispatcherPriority priority, Dispatcher dispatcher)
+        {
+            this.priority = priority;
+            this.Dispatcher = dispatcher;
+        }
+
+        public DispatcherTimer(TimeSpan interval, DispatcherPriority priority, EventHandler callback, Dispatcher dispatcher)
+        {
+            this.priority = priority;
+            this.Dispatcher = dispatcher;
+            this.Interval = interval;
+            this.Tick += callback;
+        }
+
+        ~DispatcherTimer()
+        {
+            if (this.timerHandle != null)
+            {
+                this.Stop();
+            }
+        }
+
+        public event EventHandler Tick;
+
+        public Dispatcher Dispatcher 
+        { 
+            get; 
+            private set; 
+        }
+        
+        public TimeSpan Interval 
+        {
+            get 
+            { 
+                return this.interval; 
+            }
+
+            set
+            {
+                bool enabled = this.IsEnabled;
+                this.Stop();
+                this.interval = value;
+                this.IsEnabled = enabled;
+            }
+        }
+        
+        public bool IsEnabled 
+        {
+            get
+            {
+                return this.timerHandle != null;
+            }
+            
+            set
+            {
+                if (this.IsEnabled != value)
+                {
+                    if (value)
+                    {
+                        this.Start();
+                    }
+                    else
+                    {
+                        this.Stop();
+                    }
+                }
+            }
+        }
+        
+        public object Tag 
+        { 
+            get; 
+            set; 
+        }
+
+        public void Start()
+        {
+            if (!this.IsEnabled)
+            {
+                IPlatformThreadingInterface threading = Locator.Current.GetService<IPlatformThreadingInterface>();
+                this.timerHandle = threading.StartTimer(this.Interval, this.InternalTick);
+            }
+        }
+        
+        public void Stop()
+        {
+            if (this.IsEnabled)
+            {
+                IPlatformThreadingInterface threading = Locator.Current.GetService<IPlatformThreadingInterface>();
+                threading.KillTimer(this.timerHandle);
+                this.timerHandle = null;
+            }
+        }
+
+        private void InternalTick()
+        {
+            this.Dispatcher.BeginInvoke(this.priority, (Action)this.RaiseTick);
+        }
+
+        private void RaiseTick()
+        {
+            if (this.Tick != null)
+            {
+                this.Tick(this, EventArgs.Empty);
+            }
+        }
+    }
+}

Perspex.Base/packages.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Rx-Core" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Interfaces" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Linq" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Main" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-PlatformServices" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Splat" version="1.3.3" targetFramework="portable-net45+win" />
+  <package id="StyleCop.MSBuild" version="4.7.49.0" targetFramework="portable-net45+win" developmentDependency="true" />
+</packages>

Perspex.UnitTests/Controls/ContentControlTests.cs → Perspex.Controls.UnitTests/ContentControlTests.cs

@@ -4,7 +4,7 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-namespace Perspex.UnitTests.Controls
+namespace Perspex.Controls.UnitTests
 {
     using System.Linq;
     using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -12,7 +12,6 @@ namespace Perspex.UnitTests.Controls
     using Perspex.Controls;
     using Perspex.Layout;
     using Perspex.Styling;
-    using Perspex.Themes.Default;
     using Splat;
 
     [TestClass]
@@ -116,7 +115,7 @@ namespace Perspex.UnitTests.Controls
             target.Content = child;
             this.ApplyTemplate(target);
 
-            var contentPresenter = (ContentPresenter)((IVisual)child).VisualParent;
+            var contentPresenter = child.GetVisualParent<ContentPresenter>();
             Assert.AreEqual(target, contentPresenter.TemplatedParent);
         }
 
@@ -145,7 +144,7 @@ namespace Perspex.UnitTests.Controls
                 Border border = new Border();
                 border.Background = new Perspex.Media.SolidColorBrush(0xffffffff);
                 ContentPresenter contentPresenter = new ContentPresenter();
-                contentPresenter.TemplateBinding(parent, ContentPresenter.ContentProperty);
+                ////contentPresenter[~ContentPresenter.ContentProperty] = parent[~ContentPresenter.ContentProperty];
                 border.Content = contentPresenter;
                 return border;
             });

Perspex.UnitTests/Controls/ControlTests.cs → Perspex.Controls.UnitTests/ControlTests.cs

@@ -4,7 +4,7 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-namespace Perspex.UnitTests.Controls
+namespace Perspex.Controls.UnitTests
 {
     using System.Linq;
     using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -25,27 +25,6 @@ namespace Perspex.UnitTests.Controls
             Assert.AreEqual(0, target.Classes.Count);
         }
 
-        [TestMethod]
-        public void Setting_IsPointerOver_Should_Add_PointerOver_Class()
-        {
-            var target = new Control();
-
-            target.IsPointerOver = true;
-
-            CollectionAssert.AreEqual(new[] { ":pointerover" }, target.Classes.ToArray());
-        }
-
-        [TestMethod]
-        public void Clearing_IsPointerOver_Should_Remove_PointerOver_Class()
-        {
-            var target = new Control();
-
-            target.IsPointerOver = true;
-            target.IsPointerOver = false;
-
-            Assert.AreEqual(0, target.Classes.Count);
-        }
-
         [TestMethod]
         public void Adding_Control_To_ILayoutRoot_Should_Style_Control()
         {

Perspex.Controls.UnitTests/Perspex.Controls.UnitTests.csproj

@@ -0,0 +1,125 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{5CCB5571-7C30-4E7D-967D-0E2158EBD91F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Perspex.Controls.UnitTests</RootNamespace>
+    <AssemblyName>Perspex.Controls.UnitTests</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+    <ReferencePath>$(ProgramFiles)\Common Files\microsoft shared\VSTT\$(VisualStudioVersion)\UITestExtensionPackages</ReferencePath>
+    <IsCodedUITest>False</IsCodedUITest>
+    <TestProjectType>UnitTest</TestProjectType>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Moq">
+      <HintPath>..\packages\Moq.4.2.1312.1622\lib\net40\Moq.dll</HintPath>
+    </Reference>
+    <Reference Include="Splat">
+      <HintPath>..\packages\Splat.1.3.3\lib\Net45\Splat.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+  </ItemGroup>
+  <Choose>
+    <When Condition="('$(VisualStudioVersion)' == '10.0' or '$(VisualStudioVersion)' == '') and '$(TargetFrameworkVersion)' == 'v3.5'">
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
+      </ItemGroup>
+    </When>
+    <Otherwise>
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.UnitTestFramework" />
+      </ItemGroup>
+    </Otherwise>
+  </Choose>
+  <ItemGroup>
+    <Compile Include="ContentControlTests.cs" />
+    <Compile Include="ControlTests.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="TemplatedControlTests.cs" />
+    <Compile Include="TestRoot.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Perspex.Base\Perspex.Base.csproj">
+      <Project>{b09b78d8-9b26-48b0-9149-d64a2f120f3f}</Project>
+      <Name>Perspex.Base</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Controls\Perspex.Controls.csproj">
+      <Project>{d2221c82-4a25-4583-9b43-d791e3f6820c}</Project>
+      <Name>Perspex.Controls</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Input\Perspex.Input.csproj">
+      <Project>{62024b2d-53eb-4638-b26b-85eeaa54866e}</Project>
+      <Name>Perspex.Input</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Interactivity\Perspex.Interactivity.csproj">
+      <Project>{6b0ed19d-a08b-461c-a9d9-a9ee40b0c06b}</Project>
+      <Name>Perspex.Interactivity</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Layout\Perspex.Layout.csproj">
+      <Project>{42472427-4774-4c81-8aff-9f27b8e31721}</Project>
+      <Name>Perspex.Layout</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.SceneGraph\Perspex.SceneGraph.csproj">
+      <Project>{eb582467-6abb-43a1-b052-e981ba910e3a}</Project>
+      <Name>Perspex.SceneGraph</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Styling\Perspex.Styling.csproj">
+      <Project>{f1baa01a-f176-4c6a-b39d-5b40bb1b148f}</Project>
+      <Name>Perspex.Styling</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Choose>
+    <When Condition="'$(VisualStudioVersion)' == '10.0' And '$(IsCodedUITest)' == 'True'">
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.CodedUITestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITest.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITest.Extension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITesting, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+      </ItemGroup>
+    </When>
+  </Choose>
+  <Import Project="$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets" Condition="Exists('$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets')" />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Perspex.Controls.UnitTests/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Perspex.Controls.UnitTests")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Perspex.Controls.UnitTests")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("0430478f-6126-4390-b94b-c02d91fd4f7c")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Perspex.UnitTests/Controls/TemplatedControlTests.cs → Perspex.Controls.UnitTests/TemplatedControlTests.cs

@@ -4,7 +4,7 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-namespace Perspex.UnitTests.Controls
+namespace Perspex.Controls.UnitTests
 {
     using System;
     using System.Collections.Generic;

Perspex.UnitTests/TestRoot.cs → Perspex.Controls.UnitTests/TestRoot.cs

@@ -4,13 +4,9 @@
 // </copyright>
 // -----------------------------------------------------------------------
 
-namespace Perspex.UnitTests
+namespace Perspex.Controls.UnitTests
 {
-    using System;
-    using System.Collections.Generic;
-    using System.Reactive.Disposables;
     using Moq;
-    using Perspex.Controls;
     using Perspex.Layout;
 
     internal class TestRoot : Decorator, ILayoutRoot

Perspex.Controls.UnitTests/packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Moq" version="4.2.1312.1622" targetFramework="net45" />
+  <package id="Splat" version="1.3.3" targetFramework="net45" />
+</packages>

Perspex.Controls/Border.cs

@@ -0,0 +1,62 @@
+// -----------------------------------------------------------------------
+// <copyright file="Border.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Reactive.Linq;
+    using Perspex.Layout;
+    using Perspex.Media;
+
+    public class Border : Decorator
+    {
+        static Border()
+        {
+            AffectsRender(BackgroundProperty);
+            AffectsRender(BorderBrushProperty);
+        }
+
+        public override void Render(IDrawingContext context)
+        {
+            Brush background = this.Background;
+            Brush borderBrush = this.BorderBrush;
+            double borderThickness = this.BorderThickness;
+            Rect rect = new Rect(this.ActualSize).Deflate(BorderThickness / 2);
+
+            if (background != null)
+            {
+                context.FillRectange(background, rect);
+            }
+
+            if (borderBrush != null && borderThickness > 0)
+            {
+                context.DrawRectange(new Pen(borderBrush, borderThickness), rect);
+            }
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            Control content = this.Content;
+
+            if (content != null)
+            {
+                Thickness padding = this.Padding + new Thickness(this.BorderThickness);
+                content.Arrange(new Rect(finalSize).Deflate(padding));
+            }
+
+            return finalSize;
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            return LayoutHelper.MeasureDecorator(
+                this, 
+                this.Content, 
+                availableSize, 
+                this.Padding + new Thickness(this.BorderThickness));
+        }
+    }
+}

Perspex.Controls/Button.cs

@@ -0,0 +1,49 @@
+// -----------------------------------------------------------------------
+// <copyright file="Button.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using Perspex.Interactivity;
+
+    public class Button : ContentControl
+    {
+        public static readonly RoutedEvent<RoutedEventArgs> ClickEvent =
+            RoutedEvent.Register<Button, RoutedEventArgs>("Click", RoutingStrategy.Bubble);
+
+        static Button()
+        {
+            FocusableProperty.OverrideDefaultValue(typeof(Button), true);
+        }
+
+        public Button()
+        {
+            this.PointerPressed += (s, e) =>
+            {
+                this.Classes.Add(":pressed");
+                e.Device.Capture(this);
+            };
+
+            this.PointerReleased += (s, e) =>
+            {
+                e.Device.Capture(null);
+                this.Classes.Remove(":pressed");
+
+                if (this.Classes.Contains(":pointerover"))
+                {
+                    RoutedEventArgs click = new RoutedEventArgs(ClickEvent, this);
+                    this.RaiseEvent(click);
+                }
+            };
+        }
+
+        public event EventHandler<RoutedEventArgs> Click
+        {
+            add { this.AddHandler(ClickEvent, value); }
+            remove { this.RemoveHandler(ClickEvent, value); }
+        }
+    }
+}

Perspex.Controls/CheckBox.cs

@@ -0,0 +1,12 @@
+// -----------------------------------------------------------------------
+// <copyright file="CheckBox.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class CheckBox : ToggleButton
+    {
+    }
+}

Perspex.Controls/ColumnDefinition.cs

@@ -0,0 +1,53 @@
+// -----------------------------------------------------------------------
+// <copyright file="ColumnDefinition.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class ColumnDefinition : DefinitionBase
+    {
+        public static readonly PerspexProperty<double> MaxWidthProperty =
+            PerspexProperty.Register<ColumnDefinition, double>("MaxWidth", double.PositiveInfinity);
+
+        public static readonly PerspexProperty<double> MinWidthProperty =
+            PerspexProperty.Register<ColumnDefinition, double>("MinWidth");
+
+        public static readonly PerspexProperty<GridLength> WidthProperty =
+            PerspexProperty.Register<ColumnDefinition, GridLength>("Width", new GridLength(1, GridUnitType.Star));
+
+        public ColumnDefinition()
+        {
+        }
+
+        public ColumnDefinition(GridLength width)
+        {
+            this.Width = width;
+        }
+
+        public double ActualWidth
+        {
+            get;
+            internal set;
+        }
+
+        public double MaxWidth
+        {
+            get { return this.GetValue(MaxWidthProperty); }
+            set { this.SetValue(MaxWidthProperty, value); }
+        }
+
+        public double MinWidth
+        {
+            get { return this.GetValue(MinWidthProperty); }
+            set { this.SetValue(MinWidthProperty, value); }
+        }
+
+        public GridLength Width
+        {
+            get { return this.GetValue(WidthProperty); }
+            set { this.SetValue(WidthProperty, value); }
+        }
+    }
+}

Perspex.Controls/ColumnDefinitions.cs

@@ -0,0 +1,12 @@
+// -----------------------------------------------------------------------
+// <copyright file="ColumnDefinitions.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class ColumnDefinitions : PerspexList<ColumnDefinition>
+    {
+    }
+}

Perspex.Controls/ContentControl.cs

@@ -0,0 +1,24 @@
+// -----------------------------------------------------------------------
+// <copyright file="ContentControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public class ContentControl : TemplatedControl
+    {
+        public static readonly PerspexProperty<object> ContentProperty =
+            PerspexProperty.Register<ContentControl, object>("Content");
+
+        public object Content
+        {
+            get { return this.GetValue(ContentProperty); }
+            set { this.SetValue(ContentProperty, value); }
+        }
+    }
+}

Perspex.Controls/ContentPresenter.cs

@@ -0,0 +1,151 @@
+// -----------------------------------------------------------------------
+// <copyright file="ContentPresenter.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using Perspex.Layout;
+    using Perspex.Media;
+    using Perspex.Styling;
+
+    public class ContentPresenter : Control, IVisual
+    {
+        public static readonly PerspexProperty<object> ContentProperty =
+            ContentControl.ContentProperty.AddOwner<Control>();
+
+        public static readonly PerspexProperty<Func<object, Visual>> DataTemplateProperty =
+            PerspexProperty.Register<ContentPresenter, Func<object, Visual>>("DataTemplate");
+
+        public ContentPresenter()
+        {
+            this.GetObservableWithHistory(ContentProperty).Subscribe(this.ContentChanged);
+        }
+
+        public object Content
+        {
+            get { return this.GetValue(ContentProperty); }
+            set { this.SetValue(ContentProperty, value); }
+        }
+
+        protected override IEnumerable<Visual> CreateVisualChildren()
+        {
+            object content = this.Content;
+
+            if (content != null)
+            {
+                Control result;
+
+                if (content is Control)
+                {
+                    result = (Control)content;
+                }
+                else
+                {
+                    DataTemplate dataTemplate = this.FindDataTemplate(content);
+
+                    if (dataTemplate != null)
+                    {
+                        result = dataTemplate.Build(content);
+                    }
+                    else
+                    {
+                        result = new TextBlock
+                        {
+                            Text = content.ToString(),
+                        };
+                    }
+                }
+
+                result.TemplatedParent = null;
+                return Enumerable.Repeat(result, 1);
+            }
+            else
+            {
+                return Enumerable.Empty<Visual>();
+            }
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            Control child = ((IVisual)this).VisualChildren.SingleOrDefault() as Control;
+
+            if (child != null)
+            {
+                double left;
+                double top;
+                double width;
+                double height;
+
+                switch (child.HorizontalAlignment)
+                {
+                    case HorizontalAlignment.Left:
+                        left = 0;
+                        width = child.DesiredSize.Value.Width;
+                        break;
+                    case HorizontalAlignment.Center:
+                        left = (finalSize.Width / 2) - (child.DesiredSize.Value.Width / 2);
+                        width = child.DesiredSize.Value.Width;
+                        break;
+                    case HorizontalAlignment.Right:
+                        left = finalSize.Width - child.DesiredSize.Value.Width;
+                        width = child.DesiredSize.Value.Width;
+                        break;
+                    default:
+                        left = 0;
+                        width = finalSize.Width;
+                        break;
+                }
+
+                switch (child.VerticalAlignment)
+                {
+                    case VerticalAlignment.Top:
+                        top = 0;
+                        height = child.DesiredSize.Value.Height;
+                        break;
+                    case VerticalAlignment.Center:
+                        top = (finalSize.Height / 2) - (child.DesiredSize.Value.Height / 2);
+                        height = child.DesiredSize.Value.Height;
+                        break;
+                    case VerticalAlignment.Bottom:
+                        top = finalSize.Height - child.DesiredSize.Value.Height;
+                        height = child.DesiredSize.Value.Height;
+                        break;
+                    default:
+                        top = 0;
+                        height = finalSize.Height;
+                        break;
+                }
+
+                child.Arrange(new Rect(left, top, width, height));
+            }
+
+            return finalSize;
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            Control child = ((IVisual)this).VisualChildren.SingleOrDefault() as Control;
+
+            if (child != null)
+            {
+                child.Measure(availableSize);
+                return child.DesiredSize.Value;
+            }
+
+            return new Size();
+        }
+
+        private void ContentChanged(Tuple<object, object> content)
+        {
+            var children = this.CreateVisualChildren();
+            this.ClearVisualChildren();
+            this.AddVisualChildren(children);
+            this.InvalidateMeasure();
+        }
+    }
+}

Perspex.Controls/Control.cs

@@ -0,0 +1,270 @@
+// -----------------------------------------------------------------------
+// <copyright file="Control.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using Perspex.Input;
+    using Perspex.Media;
+    using Perspex.Rendering;
+    using Perspex.Styling;
+    using Splat;
+
+    public class Control : InputElement, ILogical, IStyleable, IStyleHost
+    {
+        public static readonly PerspexProperty<Brush> BackgroundProperty =
+            PerspexProperty.Register<Control, Brush>("Background", inherits: true);
+
+        public static readonly PerspexProperty<Brush> BorderBrushProperty =
+            PerspexProperty.Register<Control, Brush>("BorderBrush");
+
+        public static readonly PerspexProperty<double> BorderThicknessProperty =
+            PerspexProperty.Register<Control, double>("BorderThickness");
+
+        public static readonly PerspexProperty<double> FontSizeProperty =
+            PerspexProperty.Register<Control, double>(
+                "FontSize",
+                defaultValue: 12.0,
+                inherits: true);
+
+        public static readonly PerspexProperty<Brush> ForegroundProperty =
+            PerspexProperty.Register<Control, Brush>("Foreground", new SolidColorBrush(0xff000000), true);
+
+        public static readonly PerspexProperty<Control> ParentProperty =
+            PerspexProperty.Register<Control, Control>("Parent");
+
+        public static readonly PerspexProperty<ITemplatedControl> TemplatedParentProperty =
+            PerspexProperty.Register<Control, ITemplatedControl>("TemplatedParent", inherits: true);
+
+        private Classes classes;
+
+        private DataTemplates dataTemplates;
+
+        private string id;
+
+        private Styles styles;
+
+        static Control()
+        {
+            AffectsMeasure(IsVisibleProperty);
+        }
+
+        public Control()
+        {
+            this.classes = new Classes();
+            this.AddPseudoClass(IsPointerOverProperty, ":pointerover");
+            this.AddPseudoClass(IsFocusedProperty, ":focus");
+        }
+
+        public Brush Background
+        {
+            get { return this.GetValue(BackgroundProperty); }
+            set { this.SetValue(BackgroundProperty, value); }
+        }
+
+        public Brush BorderBrush
+        {
+            get { return this.GetValue(BorderBrushProperty); }
+            set { this.SetValue(BorderBrushProperty, value); }
+        }
+
+        public double BorderThickness
+        {
+            get { return this.GetValue(BorderThicknessProperty); }
+            set { this.SetValue(BorderThicknessProperty, value); }
+        }
+
+        public Classes Classes
+        {
+            get 
+            {
+                return this.classes; 
+            }
+            
+            set
+            {
+                if (this.classes != value)
+                {
+                    this.classes.Clear();
+                    this.classes.Add(value);
+                }
+            }
+        }
+
+        public DataTemplates DataTemplates
+        {
+            get
+            {
+                if (this.dataTemplates == null)
+                {
+                    this.dataTemplates = new DataTemplates();
+                }
+
+                return this.dataTemplates;
+            }
+
+            set
+            {
+                this.dataTemplates = value;
+            }
+        }
+
+        public double FontSize
+        {
+            get { return this.GetValue(FontSizeProperty); }
+            set { this.SetValue(FontSizeProperty, value); }
+        }
+
+        public Brush Foreground
+        {
+            get { return this.GetValue(ForegroundProperty); }
+            set { this.SetValue(ForegroundProperty, value); }
+        }
+
+        public string Id
+        {
+            get
+            {
+                return this.id;
+            }
+
+            set
+            {
+                if (this.id != null)
+                {
+                    throw new InvalidOperationException("ID already set.");
+                }
+
+                if (((IVisual)this).VisualParent != null)
+                {
+                    throw new InvalidOperationException("Cannot set ID : control already added to tree.");
+                }
+
+                this.id = value;
+            }
+        }
+
+        public Control Parent
+        {
+            get { return this.GetValue(ParentProperty); }
+            protected set { this.SetValue(ParentProperty, value); }
+        }
+
+        public Styles Styles
+        {
+            get
+            {
+                if (this.styles == null)
+                {
+                    this.styles = new Styles();
+                }
+
+                return this.styles;
+            }
+
+            set
+            {
+                this.styles = value;
+            }
+        }
+
+        public ITemplatedControl TemplatedParent
+        {
+            get { return this.GetValue(TemplatedParentProperty); }
+            internal set { this.SetValue(TemplatedParentProperty, value); }
+        }
+
+        ILogical ILogical.LogicalParent
+        {
+            get { return this.Parent; }
+            set { this.Parent = (Control)value; }
+        }
+
+        IEnumerable<ILogical> ILogical.LogicalChildren
+        {
+            get { return Enumerable.Empty<ILogical>(); }
+        }
+
+        protected override void OnAttachedToVisualTree(IRenderRoot root)
+        {
+            IStyler styler = Locator.Current.GetService<IStyler>();
+            styler.ApplyStyles(this);
+        }
+
+        protected void AddPseudoClass(PerspexProperty<bool> property, string className)
+        {
+            this.GetObservable(property).Subscribe(x =>
+            {
+                if (x)
+                {
+                    this.classes.Add(className);
+                }
+                else
+                {
+                    this.classes.Remove(className);
+                }
+            });
+        }
+
+        protected virtual DataTemplate FindDataTemplate(object content)
+        {
+            Control control = content as Control;
+
+            if (control != null)
+            {
+                return new DataTemplate(x => control);
+            }
+
+            ILogical node = this;
+
+            while (node != null)
+            {
+                control = node as Control;
+
+                if (control != null)
+                {
+                    foreach (DataTemplate dt in control.DataTemplates.Reverse())
+                    {
+                        if (dt.Match(content))
+                        {
+                            return dt;
+                        }
+                    }
+                }
+
+                node = node.LogicalParent;
+
+                if (node == null && control != null)
+                {
+                    node = control.TemplatedParent as ILogical;
+                }
+            }
+
+            IGlobalDataTemplates global = Locator.Current.GetService<IGlobalDataTemplates>();
+
+            if (global != null)
+            {
+                foreach (DataTemplate dt in global.Reverse())
+                {
+                    if (dt.Match(content))
+                    {
+                        return dt;
+                    }
+                }
+            }
+
+            return null;
+        }
+
+        protected DataTemplate GetDataTemplate(object content)
+        {
+            return this.FindDataTemplate(content) ?? DataTemplate.Default;
+        }
+    }
+}

Perspex.Controls/ControlExtensions.cs

@@ -0,0 +1,37 @@
+// -----------------------------------------------------------------------
+// <copyright file="ControlExtensions.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using Perspex.Controls;
+    using Perspex.Styling;
+
+    public static class ControlExtensions
+    {
+        public static IEnumerable<Control> GetTemplateControls(this ITemplatedControl control)
+        {
+            return GetTemplateControls(control, (IVisual)control);
+        }
+
+        public static IEnumerable<Control> GetTemplateControls(ITemplatedControl templated, IVisual parent)
+        {
+            IVisual visual = parent as IVisual;
+
+            foreach (IVisual child in visual.VisualChildren.OfType<Control>().Where(x => x.TemplatedParent == templated))
+            {
+                yield return (Control)child;
+
+                foreach (IVisual grandchild in GetTemplateControls(templated, child))
+                {
+                    yield return (Control)grandchild;
+                }
+            }
+        }
+    }
+}

Perspex.Controls/ControlTemplate.cs

@@ -0,0 +1,40 @@
+// -----------------------------------------------------------------------
+// <copyright file="ControlTemplate.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using Perspex.Styling;
+
+    public class ControlTemplate
+    {
+        private Func<ITemplatedControl, Control> build;
+
+        public ControlTemplate(Func<ITemplatedControl, Control> build)
+        {
+            Contract.Requires<NullReferenceException>(build != null);
+
+            this.build = build;
+        }
+
+        public static ControlTemplate Create<TControl>(Func<TControl, Control> build)
+            where TControl : ITemplatedControl
+        {
+            Contract.Requires<NullReferenceException>(build != null);
+
+            return new ControlTemplate(c => build((TControl)c));
+        }
+
+        public Control Build(ITemplatedControl templatedParent)
+        {
+            Contract.Requires<NullReferenceException>(templatedParent != null);
+
+            Control root = this.build(templatedParent);
+            root.TemplatedParent = templatedParent;
+            return root;
+        }
+    }
+}

Perspex.Controls/Controls.cs

@@ -0,0 +1,22 @@
+// -----------------------------------------------------------------------
+// <copyright file="Controls.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+using System.Collections.Generic;
+
+namespace Perspex.Controls
+{
+    public class Controls : PerspexList<Control>
+    {
+        public Controls()
+        {
+        }
+
+        public Controls(IEnumerable<Control> items)
+            : base(items)
+        {
+        }
+    }
+}

Perspex.Controls/DataTemplate.cs

@@ -0,0 +1,68 @@
+// -----------------------------------------------------------------------
+// <copyright file="DataTemplate.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Reflection;
+
+    public class DataTemplate
+    {
+        public static readonly DataTemplate Default =
+            new DataTemplate(typeof(object), o => new TextBlock { Text = o.ToString() });
+
+        public DataTemplate(Func<object, Control> build)
+            : this(o => true, build)
+        {
+        }
+
+        public DataTemplate(Type type, Func<object, Control> build)
+            : this(o => IsInstance(o, type), build)
+        {
+        }
+
+        public DataTemplate(Func<object, bool> match, Func<object, Control> build)
+        {
+            Contract.Requires<ArgumentNullException>(match != null);
+            Contract.Requires<ArgumentNullException>(build != null);
+
+            this.Match = match;
+            this.Build = build;
+        }
+
+        public static bool IsInstance(object o, Type t)
+        {
+            return t.GetTypeInfo().IsAssignableFrom(o.GetType().GetTypeInfo());
+        }
+
+        public Func<object, bool> Match { get; private set; }
+
+        public Func<object, Control> Build { get; private set; }
+    }
+
+    public class DataTemplate<T> : DataTemplate
+    {
+        public DataTemplate(Func<T, Control> build)
+            : base(typeof(T), Cast(build))
+        {
+        }
+
+        public DataTemplate(Func<T, bool> match, Func<T, Control> build)
+            : base(CastMatch(match), Cast(build))
+        {
+        }
+
+        private static Func<object, bool> CastMatch(Func<T, bool> f)
+        {
+            return o => (o is T) ? f((T)o) : false;
+        }
+
+        private static Func<object, TResult> Cast<TResult>(Func<T, TResult> f)
+        {
+            return o => f((T)o);
+        }
+    }
+}

Perspex.Controls/DataTemplates.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="DataTemplates.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Collections.Specialized;
+    using System.Linq;
+    using System.Reactive;
+    using System.Reactive.Subjects;
+
+    public class DataTemplates : PerspexList<DataTemplate>
+    {
+    }
+}

Perspex.Controls/Decorator.cs

@@ -0,0 +1,65 @@
+// -----------------------------------------------------------------------
+// <copyright file="Decorator.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using Perspex.Layout;
+
+    public class Decorator : Control, IVisual
+    {
+        public static readonly PerspexProperty<Control> ContentProperty =
+            PerspexProperty.Register<Decorator, Control>("Content");
+
+        public static readonly PerspexProperty<Thickness> PaddingProperty =
+            PerspexProperty.Register<Decorator, Thickness>("Padding");
+
+        public Decorator()
+        {
+            this.GetObservable(ContentProperty).Subscribe(x =>
+            {
+                this.ClearVisualChildren();
+
+                if (x != null)
+                {
+                    this.AddVisualChild(x);
+                }
+            });
+        }
+
+        public Control Content
+        {
+            get { return this.GetValue(ContentProperty); }
+            set { this.SetValue(ContentProperty, value); }
+        }
+
+        public Thickness Padding
+        {
+            get { return this.GetValue(PaddingProperty); }
+            set { this.SetValue(PaddingProperty, value); }
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            Control content = this.Content;
+
+            if (content != null)
+            {
+                content.Arrange(new Rect(finalSize).Deflate(this.Padding));
+            }
+
+            return finalSize;
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            return LayoutHelper.MeasureDecorator(this, this.Content, availableSize, this.Padding);
+        }
+    }
+}

Perspex.Controls/DefinitionBase.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="DefinitionBase.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class DefinitionBase : PerspexObject
+    {
+        public static readonly PerspexProperty<string> SharedSizeGroupProperty =
+            PerspexProperty.Register<DefinitionBase, string>("SharedSizeGroup", inherits: true);
+
+        public string SharedSizeGroup
+        {
+            get { return this.GetValue(SharedSizeGroupProperty); }
+            set { this.SetValue(SharedSizeGroupProperty, value); }
+        }
+    }
+}

Perspex.Controls/Grid.cs

@@ -0,0 +1,805 @@
+// -----------------------------------------------------------------------
+// <copyright file="Grid.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public class Grid : Panel
+    {
+        public static readonly PerspexProperty<int> ColumnProperty =
+            PerspexProperty.RegisterAttached<Grid, Control, int>("Column");
+
+        public static readonly PerspexProperty<int> ColumnSpanProperty =
+            PerspexProperty.RegisterAttached<Grid, Control, int>("ColumnSpan", 1);
+
+        public static readonly PerspexProperty<bool> IsSharedSizeScopeProperty =
+            PerspexProperty.RegisterAttached<Grid, Control, bool>("IsSharedSizeScopeProperty");
+
+        public static readonly PerspexProperty<int> RowProperty =
+            PerspexProperty.RegisterAttached<Grid, Control, int>("Row");
+
+        public static readonly PerspexProperty<int> RowSpanProperty =
+            PerspexProperty.RegisterAttached<Grid, Control, int>("RowSpan", 1);
+
+        private Segment[,] rowMatrix;
+        private Segment[,] colMatrix;
+
+        public Grid()
+        {
+            this.ColumnDefinitions = new ColumnDefinitions();
+            this.RowDefinitions = new RowDefinitions();
+        }
+
+        public ColumnDefinitions ColumnDefinitions
+        {
+            get;
+            set;
+        }
+
+        public RowDefinitions RowDefinitions
+        {
+            get;
+            set;
+        }
+
+        public static int GetColumn(PerspexObject element)
+        {
+            return element.GetValue(ColumnProperty);
+        }
+
+        public static int GetColumnSpan(PerspexObject element)
+        {
+            return element.GetValue(ColumnSpanProperty);
+        }
+
+        public static int GetRow(PerspexObject element)
+        {
+            return element.GetValue(RowProperty);
+        }
+
+        public static int GetRowSpan(PerspexObject element)
+        {
+            return element.GetValue(RowSpanProperty);
+        }
+
+        public static void SetColumn(PerspexObject element, int value)
+        {
+            element.SetValue(ColumnProperty, value);
+        }
+
+        public static void SetColumnSpan(PerspexObject element, int value)
+        {
+            element.SetValue(ColumnSpanProperty, value);
+        }
+
+        public static void SetRow(PerspexObject element, int value)
+        {
+            element.SetValue(RowProperty, value);
+        }
+
+        public static void SetRowSpan(PerspexObject element, int value)
+        {
+            element.SetValue(RowSpanProperty, value);
+        }
+
+        protected override Size MeasureOverride(Size constraint)
+        {
+            Size totalSize = constraint;
+            int colCount = this.ColumnDefinitions.Count;
+            int rowCount = this.RowDefinitions.Count;
+            double totalStarsX = 0;
+            double totalStarsY = 0;
+            bool emptyRows = rowCount == 0;
+            bool emptyCols = colCount == 0;
+            bool hasChildren = this.Children.Count > 0;
+
+            if (emptyRows)
+            {
+                rowCount = 1;
+            }
+
+            if (emptyCols)
+            {
+                colCount = 1;
+            }
+
+            this.CreateMatrices(rowCount, colCount);
+
+            if (emptyRows)
+            {
+                this.rowMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
+                this.rowMatrix[0, 0].Stars = 1.0;
+                totalStarsY += 1.0;
+            }
+            else
+            {
+                for (int i = 0; i < rowCount; i++)
+                {
+                    RowDefinition rowdef = this.RowDefinitions[i];
+                    GridLength height = rowdef.Height;
+
+                    rowdef.ActualHeight = double.PositiveInfinity;
+                    this.rowMatrix[i, i] = new Segment(0, rowdef.MinHeight, rowdef.MaxHeight, height.GridUnitType);
+
+                    if (height.GridUnitType == GridUnitType.Pixel)
+                    {
+                        this.rowMatrix[i, i].OfferedSize = Clamp(height.Value, this.rowMatrix[i, i].Min, this.rowMatrix[i, i].Max);
+                        this.rowMatrix[i, i].DesiredSize = this.rowMatrix[i, i].OfferedSize;
+                        rowdef.ActualHeight = this.rowMatrix[i, i].OfferedSize;
+                    }
+                    else if (height.GridUnitType == GridUnitType.Star)
+                    {
+                        this.rowMatrix[i, i].Stars = height.Value;
+                        totalStarsY += height.Value;
+                    }
+                    else if (height.GridUnitType == GridUnitType.Auto)
+                    {
+                        this.rowMatrix[i, i].OfferedSize = Clamp(0, this.rowMatrix[i, i].Min, this.rowMatrix[i, i].Max);
+                        this.rowMatrix[i, i].DesiredSize = this.rowMatrix[i, i].OfferedSize;
+                    }
+                }
+            }
+
+            if (emptyCols)
+            {
+                this.colMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
+                this.colMatrix[0, 0].Stars = 1.0;
+                totalStarsX += 1.0;
+            }
+            else
+            {
+                for (int i = 0; i < colCount; i++)
+                {
+                    ColumnDefinition coldef = this.ColumnDefinitions[i];
+                    GridLength width = coldef.Width;
+
+                    coldef.ActualWidth = double.PositiveInfinity;
+                    this.colMatrix[i, i] = new Segment(0, coldef.MinWidth, coldef.MaxWidth, width.GridUnitType);
+
+                    if (width.GridUnitType == GridUnitType.Pixel)
+                    {
+                        this.colMatrix[i, i].OfferedSize = Clamp(width.Value, this.colMatrix[i, i].Min, this.colMatrix[i, i].Max);
+                        this.colMatrix[i, i].DesiredSize = this.colMatrix[i, i].OfferedSize;
+                        coldef.ActualWidth = this.colMatrix[i, i].OfferedSize;
+                    }
+                    else if (width.GridUnitType == GridUnitType.Star)
+                    {
+                        this.colMatrix[i, i].Stars = width.Value;
+                        totalStarsX += width.Value;
+                    }
+                    else if (width.GridUnitType == GridUnitType.Auto)
+                    {
+                        this.colMatrix[i, i].OfferedSize = Clamp(0, this.colMatrix[i, i].Min, this.colMatrix[i, i].Max);
+                        this.colMatrix[i, i].DesiredSize = this.colMatrix[i, i].OfferedSize;
+                    }
+                }
+            }
+
+            List<GridNode> sizes = new List<GridNode>();
+            GridNode node;
+            GridNode separator = new GridNode(null, 0, 0, 0);
+            int separatorIndex;
+
+            sizes.Add(separator);
+
+            // Pre-process the grid children so that we know what types of elements we have so
+            // we can apply our special measuring rules.
+            GridWalker gridWalker = new GridWalker(this, this.rowMatrix, this.colMatrix);
+
+            for (int i = 0; i < 6; i++)
+            {
+                // These bools tell us which grid element type we should be measuring. i.e.
+                // 'star/auto' means we should measure elements with a star row and auto col
+                bool autoAuto = i == 0;
+                bool starAuto = i == 1;
+                bool autoStar = i == 2;
+                bool starAutoAgain = i == 3;
+                bool nonStar = i == 4;
+                bool remainingStar = i == 5;
+
+                if (hasChildren)
+                {
+                    this.ExpandStarCols(totalSize);
+                    this.ExpandStarRows(totalSize);
+                }
+
+                foreach (Control child in this.Children)
+                {
+                    int col, row;
+                    int colspan, rowspan;
+                    double childSizeX = 0;
+                    double childSizeY = 0;
+                    bool starCol = false;
+                    bool starRow = false;
+                    bool autoCol = false;
+                    bool autoRow = false;
+
+                    col = Math.Min(GetColumn(child), colCount - 1);
+                    row = Math.Min(GetRow(child), rowCount - 1);
+                    colspan = Math.Min(GetColumnSpan(child), colCount - col);
+                    rowspan = Math.Min(GetRowSpan(child), rowCount - row);
+
+                    for (int r = row; r < row + rowspan; r++)
+                    {
+                        starRow |= this.rowMatrix[r, r].Type == GridUnitType.Star;
+                        autoRow |= this.rowMatrix[r, r].Type == GridUnitType.Auto;
+                    }
+
+                    for (int c = col; c < col + colspan; c++)
+                    {
+                        starCol |= this.colMatrix[c, c].Type == GridUnitType.Star;
+                        autoCol |= this.colMatrix[c, c].Type == GridUnitType.Auto;
+                    }
+
+                    // This series of if statements checks whether or not we should measure
+                    // the current element and also if we need to override the sizes
+                    // passed to the Measure call. 
+
+                    // If the element has Auto rows and Auto columns and does not span Star
+                    // rows/cols it should only be measured in the auto_auto phase.
+                    // There are similar rules governing auto/star and star/auto elements.
+                    // NOTE: star/auto elements are measured twice. The first time with
+                    // an override for height, the second time without it.
+                    if (autoRow && autoCol && !starRow && !starCol)
+                    {
+                        if (!autoAuto)
+                        {
+                            continue;
+                        }
+
+                        childSizeX = double.PositiveInfinity;
+                        childSizeY = double.PositiveInfinity;
+                    }
+                    else if (starRow && autoCol && !starCol)
+                    {
+                        if (!(starAuto || starAutoAgain))
+                        {
+                            continue;
+                        }
+
+                        if (starAuto && gridWalker.HasAutoStar)
+                        {
+                            childSizeY = double.PositiveInfinity;
+                        }
+
+                        childSizeX = double.PositiveInfinity;
+                    }
+                    else if (autoRow && starCol && !starRow)
+                    {
+                        if (!autoStar)
+                        {
+                            continue;
+                        }
+
+                        childSizeY = double.PositiveInfinity;
+                    }
+                    else if ((autoRow || autoCol) && !(starRow || starCol))
+                    {
+                        if (!nonStar)
+                        {
+                            continue;
+                        }
+
+                        if (autoRow)
+                        {
+                            childSizeY = double.PositiveInfinity;
+                        }
+
+                        if (autoCol)
+                        {
+                            childSizeX = double.PositiveInfinity;
+                        }
+                    }
+                    else if (!(starRow || starCol))
+                    {
+                        if (!nonStar)
+                        {
+                            continue;
+                        }
+                    }
+                    else
+                    {
+                        if (!remainingStar)
+                        {
+                            continue;
+                        }
+                    }
+
+                    for (int r = row; r < row + rowspan; r++)
+                    {
+                        childSizeY += this.rowMatrix[r, r].OfferedSize;
+                    }
+
+                    for (int c = col; c < col + colspan; c++)
+                    {
+                        childSizeX += this.colMatrix[c, c].OfferedSize;
+                    }
+
+                    child.Measure(new Size(childSizeX, childSizeY));
+                    Size desired = child.DesiredSize.Value;
+
+                    // Elements distribute their height based on two rules:
+                    // 1) Elements with rowspan/colspan == 1 distribute their height first
+                    // 2) Everything else distributes in a LIFO manner.
+                    // As such, add all UIElements with rowspan/colspan == 1 after the separator in
+                    // the list and everything else before it. Then to process, just keep popping
+                    // elements off the end of the list.
+                    if (!starAuto)
+                    {
+                        node = new GridNode(this.rowMatrix, row + rowspan - 1, row, desired.Height);
+                        separatorIndex = sizes.IndexOf(separator);
+                        sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
+                    }
+
+                    node = new GridNode(this.colMatrix, col + colspan - 1, col, desired.Width);
+
+                    separatorIndex = sizes.IndexOf(separator);
+                    sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
+                }
+
+                sizes.Remove(separator);
+
+                while (sizes.Count > 0)
+                {
+                    node = sizes.Last();
+                    node.Matrix[node.Row, node.Column].DesiredSize = Math.Max(node.Matrix[node.Row, node.Column].DesiredSize, node.Size);
+                    this.AllocateDesiredSize(rowCount, colCount);
+                    sizes.Remove(node);
+                }
+
+                sizes.Add(separator);
+            }
+
+            // Once we have measured and distributed all sizes, we have to store
+            // the results. Every time we want to expand the rows/cols, this will
+            // be used as the baseline.
+            this.SaveMeasureResults();
+
+            sizes.Remove(separator);
+
+            double gridSizeX = 0;
+            double gridSizeY = 0;
+            
+            for (int c = 0; c < colCount; c++)
+            {
+                gridSizeX += this.colMatrix[c, c].DesiredSize;
+            }
+
+            for (int r = 0; r < rowCount; r++)
+            {
+                gridSizeY += this.rowMatrix[r, r].DesiredSize;
+            }
+
+            return new Size(gridSizeX, gridSizeY);
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            int colCount = this.ColumnDefinitions.Count;
+            int rowCount = this.RowDefinitions.Count;
+            int colMatrixDim = this.colMatrix.GetUpperBound(0) + 1;
+            int rowMatrixDim = this.rowMatrix.GetUpperBound(0) + 1;
+
+            this.RestoreMeasureResults();
+
+            double totalConsumedX = 0;
+            double totalConsumedY = 0;
+
+            for (int c = 0; c < colMatrixDim; c++) 
+            {
+                this.colMatrix[c, c].OfferedSize = this.colMatrix[c, c].DesiredSize;
+                totalConsumedX += this.colMatrix[c, c].OfferedSize;
+            }
+
+            for (int r = 0; r < rowMatrixDim; r++) 
+            {
+                this.rowMatrix[r, r].OfferedSize = this.rowMatrix[r, r].DesiredSize;
+                totalConsumedY += this.rowMatrix[r, r].OfferedSize;
+            }
+
+            if (totalConsumedX != finalSize.Width)
+            {
+                this.ExpandStarCols(finalSize);
+            }
+
+            if (totalConsumedY != finalSize.Height)
+            {
+                this.ExpandStarRows(finalSize);
+            }
+
+            for (int c = 0; c < colCount; c++)
+            {
+                this.ColumnDefinitions[c].ActualWidth = this.colMatrix[c, c].OfferedSize;
+            }
+
+            for (int r = 0; r < rowCount; r++)
+            {
+                this.RowDefinitions[r].ActualHeight = this.rowMatrix[r, r].OfferedSize;
+            }
+
+            foreach (Control child in this.Children)
+            {
+                int col = Math.Min(GetColumn(child), colMatrixDim - 1);
+                int row = Math.Min(GetRow(child), rowMatrixDim - 1);
+                int colspan = Math.Min(GetColumnSpan(child), colMatrixDim - col);
+                int rowspan = Math.Min(GetRowSpan(child), rowMatrixDim - row);
+
+                double childFinalX = 0;
+                double childFinalY = 0;
+                double childFinalW = 0;
+                double childFinalH = 0;
+
+                for (int c = 0; c < col; c++)
+                {
+                    childFinalX += this.colMatrix[c, c].OfferedSize;
+                }
+
+                for (int c = col; c < col + colspan; c++)
+                {
+                    childFinalW += this.colMatrix[c, c].OfferedSize;
+                }
+
+                for (int r = 0; r < row; r++)
+                {
+                    childFinalY += this.rowMatrix[r, r].OfferedSize;
+                }
+
+                for (int r = row; r < row + rowspan; r++)
+                {
+                    childFinalH += this.rowMatrix[r, r].OfferedSize;
+                }
+
+                child.Arrange(new Rect(childFinalX, childFinalY, childFinalW, childFinalH));
+            }
+
+            return finalSize;
+        }
+
+        private static double Clamp(double val, double min, double max)
+        {
+            if (val < min)
+            {
+                return min;
+            }
+            else if (val > max)
+            {
+                return max;
+            }
+            else
+            {
+                return val;
+            }
+        }
+
+        private void CreateMatrices(int rowCount, int colCount)
+        {
+            if (this.rowMatrix == null || this.colMatrix == null ||
+                this.rowMatrix.GetUpperBound(0) != rowCount - 1 ||
+                this.colMatrix.GetUpperBound(0) != colCount - 1)
+            {
+                this.rowMatrix = new Segment[rowCount, rowCount];
+                this.colMatrix = new Segment[colCount, colCount];
+            }
+        }
+
+        private void ExpandStarCols(Size availableSize)
+        {
+            int columnsCount = this.ColumnDefinitions.Count;
+            double width = availableSize.Width;
+
+            for (int i = 0; i < this.colMatrix.GetUpperBound(0) + 1; i++) 
+            {
+                if (this.colMatrix[i, i].Type == GridUnitType.Star)
+                {
+                    this.colMatrix[i, i].OfferedSize = 0;
+                }
+                else
+                {
+                    width = Math.Max(availableSize.Width - this.colMatrix[i, i].OfferedSize, 0);
+                }
+            }
+
+            this.AssignSize(this.colMatrix, 0, this.colMatrix.GetUpperBound(0), ref width, GridUnitType.Star, false);
+            width = Math.Max(0, width);
+
+            if (columnsCount > 0) 
+            {
+                for (int i = 0; i < this.colMatrix.GetUpperBound(0) + 1; i++)
+                {
+                    if (this.colMatrix[i, i].Type == GridUnitType.Star)
+                    {
+                        this.ColumnDefinitions[i].ActualWidth = this.colMatrix[i, i].OfferedSize;
+                    }
+                }
+            }
+        }
+
+        private void ExpandStarRows(Size availableSize)
+        {
+            int rowCount = this.RowDefinitions.Count;
+            double height = availableSize.Height;
+
+            // When expanding star rows, we need to zero out their height before
+            // calling AssignSize. AssignSize takes care of distributing the 
+            // available size when there are Mins and Maxs applied.
+            for (int i = 0; i < this.rowMatrix.GetUpperBound(0) + 1; i++) 
+            {
+                if (this.rowMatrix[i, i].Type == GridUnitType.Star)
+                {
+                    this.rowMatrix[i, i].OfferedSize = 0.0;
+                }
+                else
+                {
+                    height = Math.Max(availableSize.Height - this.rowMatrix[i, i].OfferedSize, 0);
+                }
+            }
+
+            this.AssignSize(this.rowMatrix, 0, this.rowMatrix.GetUpperBound(0), ref height, GridUnitType.Star, false);
+
+            if (rowCount > 0) 
+            {
+                for (int i = 0; i < this.rowMatrix.GetUpperBound(0) + 1; i++)
+                {
+                    if (this.rowMatrix[i, i].Type == GridUnitType.Star)
+                    {
+                        this.RowDefinitions[i].ActualHeight = this.rowMatrix[i, i].OfferedSize;
+                    }
+                }
+            }
+        }
+
+        private void AssignSize(
+            Segment[,] matrix, 
+            int start, 
+            int end, 
+            ref double size, 
+            GridUnitType type, 
+            bool desiredSize)
+        {
+            double count = 0;
+            bool assigned;
+
+            // Count how many segments are of the correct type. If we're measuring Star rows/cols
+            // we need to count the number of stars instead.
+            for (int i = start; i <= end; i++) 
+            {
+                double segmentSize = desiredSize ? matrix[i, i].DesiredSize : matrix[i, i].OfferedSize;
+                if (segmentSize < matrix[i, i].Max)
+                {
+                    count += type == GridUnitType.Star ? matrix[i, i].Stars : 1;
+                }
+            }
+
+            do 
+            {
+                double contribution = size / count;
+
+                assigned = false;
+
+                for (int i = start; i <= end; i++) 
+                {
+                    double segmentSize = desiredSize ? matrix[i, i].DesiredSize : matrix[i, i].OfferedSize;
+
+                    if (!(matrix[i, i].Type == type && segmentSize < matrix[i, i].Max))
+                    {
+                        continue;
+                    }
+
+                    double newsize = segmentSize;
+                    newsize += contribution * (type == GridUnitType.Star ? matrix[i, i].Stars : 1);
+                    newsize = Math.Min(newsize, matrix[i, i].Max);
+                    assigned |= newsize > segmentSize;
+                    size -= newsize - segmentSize;
+
+                    if (desiredSize)
+                    {
+                        matrix[i, i].DesiredSize = newsize;
+                    }
+                    else
+                    {
+                        matrix[i, i].OfferedSize = newsize;
+                    }
+                }
+            } 
+            while (assigned);
+        }
+
+        private void AllocateDesiredSize(int rowCount, int colCount)
+        {
+            // First allocate the heights of the RowDefinitions, then allocate
+            // the widths of the ColumnDefinitions.
+            for (int i = 0; i < 2; i++) 
+            {
+                Segment[,] matrix = i == 0 ? this.rowMatrix : this.colMatrix;
+                int count = i == 0 ? rowCount : colCount;
+
+                for (int row = count - 1; row >= 0; row--) 
+                {
+                    for (int col = row; col >= 0; col--) 
+                    {
+                        bool spansStar = false;
+                        for (int j = row; j >= col; j--)
+                        {
+                            spansStar |= matrix[j, j].Type == GridUnitType.Star;
+                        }
+
+                        // This is the amount of pixels which must be available between the grid rows
+                        // at index 'col' and 'row'. i.e. if 'row' == 0 and 'col' == 2, there must
+                        // be at least 'matrix [row][col].size' pixels of height allocated between
+                        // all the rows in the range col -> row.
+                        double current = matrix[row, col].DesiredSize;
+
+                        // Count how many pixels have already been allocated between the grid rows
+                        // in the range col -> row. The amount of pixels allocated to each grid row/column
+                        // is found on the diagonal of the matrix.
+                        double totalAllocated = 0;
+                        
+                        for (int k = row; k >= col; k--)
+                        {
+                            totalAllocated += matrix[k, k].DesiredSize;
+                        }
+
+                        // If the size requirement has not been met, allocate the additional required
+                        // size between 'pixel' rows, then 'star' rows, finally 'auto' rows, until all
+                        // height has been assigned.
+                        if (totalAllocated < current) 
+                        {
+                            double additional = current - totalAllocated;
+
+                            if (spansStar) 
+                            {
+                                this.AssignSize(matrix, col, row, ref additional, GridUnitType.Star, true);
+                            } 
+                            else 
+                            {
+                                this.AssignSize(matrix, col, row, ref additional, GridUnitType.Pixel, true);
+                                this.AssignSize(matrix, col, row, ref additional, GridUnitType.Auto, true);
+                            }
+                        }
+                    }
+                }
+            }
+
+            for (int r = 0; r < this.rowMatrix.GetUpperBound(0) + 1; r++)
+            {
+                this.rowMatrix[r, r].OfferedSize = this.rowMatrix[r, r].DesiredSize;
+            }
+
+            for (int c = 0; c < this.colMatrix.GetUpperBound(0) + 1; c++)
+            {
+                this.colMatrix[c, c].OfferedSize = this.colMatrix[c, c].DesiredSize;
+            }
+        }
+
+        private void SaveMeasureResults()
+        {
+            for (int i = 0; i < this.rowMatrix.GetUpperBound(0) + 1; i++)
+            {
+                for (int j = 0; j < this.rowMatrix.GetUpperBound(0) + 1; j++)
+                {
+                    this.rowMatrix[i, j].OriginalSize = this.rowMatrix[i, j].OfferedSize;
+                }
+            }
+
+            for (int i = 0; i < this.colMatrix.GetUpperBound(0); i++)
+            {
+                for (int j = 0; j < this.colMatrix.GetUpperBound(0); j++)
+                {
+                    this.colMatrix[i, j].OriginalSize = this.colMatrix[i, j].OfferedSize;
+                }
+            }
+        }
+
+        private void RestoreMeasureResults()
+        {
+            for (int i = 0; i < this.rowMatrix.GetUpperBound(0) + 1; i++)
+            {
+                for (int j = 0; j < this.rowMatrix.GetUpperBound(0) + 1; j++)
+                {
+                    this.rowMatrix[i, j].OfferedSize = this.rowMatrix[i, j].OriginalSize;
+                }
+            }
+
+            for (int i = 0; i < this.colMatrix.GetUpperBound(0) + 1; i++)
+            {
+                for (int j = 0; j < this.colMatrix.GetUpperBound(0) + 1; j++)
+                {
+                    this.colMatrix[i, j].OfferedSize = this.colMatrix[i, j].OriginalSize;
+                }
+            }
+        }
+
+        private struct Segment
+        {
+            public double OriginalSize;
+            public double Max;
+            public double Min;
+            public double DesiredSize;
+            public double OfferedSize;
+            public double Stars;
+            public GridUnitType Type;
+
+            public Segment(double offeredSize, double min, double max, GridUnitType type)
+            {
+                this.OriginalSize = 0;
+                this.Min = min;
+                this.Max = max;
+                this.DesiredSize = 0;
+                this.OfferedSize = offeredSize;
+                this.Stars = 0;
+                this.Type = type;
+            }
+
+            public void Init(double offeredSize, double min, double max, GridUnitType type)
+            {
+                this.OfferedSize = offeredSize;
+                this.Min = min;
+                this.Max = max;
+                this.Type = type;
+            }
+        }
+
+        private struct GridNode
+        {
+            public int Row;
+            public int Column;
+            public double Size;
+            public Segment[,] Matrix;
+
+            public GridNode(Segment[,] matrix, int row, int col, double size)
+            {
+                this.Matrix = matrix;
+                this.Row = row;
+                this.Column = col;
+                this.Size = size;
+            }
+        }
+
+        private class GridWalker 
+        {
+            public GridWalker(Grid grid, Segment[,] rowMatrix, Segment[,] colMatrix)
+            {
+                foreach (Control child in grid.Children)
+                {
+                    bool starCol = false;
+                    bool starRow = false;
+                    bool autoCol = false;
+                    bool autoRow = false;
+
+                    int col = Math.Min(Grid.GetColumn(child), colMatrix.GetUpperBound(0));
+                    int row = Math.Min(Grid.GetRow(child), rowMatrix.GetUpperBound(0));
+                    int colspan = Math.Min(Grid.GetColumnSpan(child), colMatrix.GetUpperBound(0));
+                    int rowspan = Math.Min(Grid.GetRowSpan(child), rowMatrix.GetUpperBound(0));
+
+                    for (int r = row; r < row + rowspan; r++) 
+                    {
+                        starRow |= rowMatrix[r, r].Type == GridUnitType.Star;
+                        autoRow |= rowMatrix[r, r].Type == GridUnitType.Auto;
+                    }
+
+                    for (int c = col; c < col + colspan; c++) 
+                    {
+                        starCol |= colMatrix[c, c].Type == GridUnitType.Star;
+                        autoCol |= colMatrix[c, c].Type == GridUnitType.Auto;
+                    }
+
+                    this.HasAutoAuto |= autoRow && autoCol && !starRow && !starCol;
+                    this.HasStarAuto |= starRow && autoCol;
+                    this.HasAutoStar |= autoRow && starCol;
+                }
+            }
+
+            public bool HasAutoAuto { get; private set; }
+
+            public bool HasStarAuto { get; private set; }
+            
+            public bool HasAutoStar { get; private set; }
+        }
+    }
+}

Perspex.Controls/GridLength.cs

@@ -0,0 +1,121 @@
+// -----------------------------------------------------------------------
+// <copyright file="GridLength.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+
+    public enum GridUnitType
+    {
+        Auto = 0,
+        Pixel = 1,
+        Star = 2,
+    }
+
+    public struct GridLength : IEquatable<GridLength>
+    {
+        private GridUnitType type;
+
+        private double value;
+
+        public GridLength(double value)
+            : this(value, GridUnitType.Pixel)
+        {
+        }
+
+        public GridLength(double value, GridUnitType type)
+        {
+            if (value < 0 || double.IsNaN(value) || double.IsInfinity(value))
+            {
+                throw new ArgumentException("Invalid value", "value");
+            }
+
+            if (type < GridUnitType.Auto || type > GridUnitType.Star)
+            {
+                throw new ArgumentException("Invalid value", "type");
+            }
+
+            this.type = type;
+            this.value = value;
+        }
+
+        public static GridLength Auto 
+        {
+            get { return new GridLength(0, GridUnitType.Auto); }
+        }
+
+        public GridUnitType GridUnitType
+        {
+            get { return this.type; }
+        }
+
+        public bool IsAbsolute
+        {
+            get { return this.type == GridUnitType.Pixel; }
+        }
+
+        public bool IsAuto
+        {
+            get { return this.type == GridUnitType.Auto; }
+        }
+
+        public bool IsStar 
+        {
+            get { return this.type == GridUnitType.Star; }
+        }
+
+        public double Value 
+        {
+            get { return this.value; }
+        }
+
+        public static bool operator ==(GridLength a, GridLength b)
+        {
+            return (a.IsAuto && b.IsAuto) || (a.value == b.value && a.type == b.type);
+        }
+
+        public static bool operator !=(GridLength gl1, GridLength gl2)
+        {
+            return !(gl1 == gl2);
+        }
+
+        public override bool Equals(object o)
+        {
+            if (o == null)
+            {
+                return false;
+            }
+
+            if (!(o is GridLength))
+            {
+                return false;
+            }
+
+            return this == (GridLength)o;
+        }
+
+        public bool Equals(GridLength gridLength)
+        {
+            return this == gridLength;
+        }
+
+        public override int GetHashCode()
+        {
+            return this.value.GetHashCode() ^ this.type.GetHashCode();
+        }
+
+        public override string ToString()
+        {
+            if (this.IsAuto)
+            {
+                return "Auto";
+            }
+
+            string s = this.value.ToString();
+            return this.IsStar ? s + "*" : s;
+        }
+    }
+}

Perspex.Controls/HeaderedContentControl.cs

@@ -0,0 +1,24 @@
+// -----------------------------------------------------------------------
+// <copyright file="ContentControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public class HeaderedContentControl : ContentControl, IHeadered
+    {
+        public static readonly PerspexProperty<object> HeaderProperty =
+            PerspexProperty.Register<ContentControl, object>("Header");
+
+        public object Header
+        {
+            get { return this.GetValue(HeaderProperty); }
+            set { this.SetValue(HeaderProperty, value); }
+        }
+    }
+}

Perspex.Controls/HeaderedItemsControl.cs

@@ -0,0 +1,25 @@
+// -----------------------------------------------------------------------
+// <copyright file="HeaderedItemsControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Linq;
+    using System.Reactive.Linq;
+
+    public class HeaderedItemsControl : ItemsControl
+    {
+        public static readonly PerspexProperty<object> HeaderProperty =
+            HeaderedContentControl.HeaderProperty.AddOwner<HeaderedItemsControl>();
+
+        public object Header
+        {
+            get { return this.GetValue(HeaderProperty); }
+            set { this.SetValue(HeaderProperty, value); }
+        }
+    }
+}

Perspex.Controls/IGlobalDataTemplates.cs

@@ -0,0 +1,14 @@
+// -----------------------------------------------------------------------
+// <copyright file="IGlobalDataTemplates.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System.Collections.Generic;
+
+    public interface IGlobalDataTemplates : IEnumerable<DataTemplate>
+    {
+    }
+}

Perspex.Controls/IHeadered.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IHeadered.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public interface IHeadered
+    {
+        object Header { get; set; }
+    }
+}

Perspex.Controls/Image.cs

@@ -0,0 +1,115 @@
+// -----------------------------------------------------------------------
+// <copyright file="Image.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using Perspex.Media;
+    using Perspex.Media.Imaging;
+
+    public class Image : Control
+    {
+        public static readonly PerspexProperty<Bitmap> SourceProperty =
+            PerspexProperty.Register<Image, Bitmap>("Source");
+
+        public static readonly PerspexProperty<Stretch> StretchProperty =
+            PerspexProperty.Register<Image, Stretch>("Stretch", Stretch.Uniform);
+
+        public Bitmap Source
+        {
+            get { return this.GetValue(SourceProperty); }
+            set { this.SetValue(SourceProperty, value); }
+        }
+
+        public Stretch Stretch 
+        { 
+            get { return (Stretch)this.GetValue(StretchProperty); }
+            set { this.SetValue(StretchProperty, value); }
+        }
+
+        public override void Render(IDrawingContext drawingContext)
+        {
+            Brush background = this.Background;
+            Bitmap source = this.Source;
+
+            if (background != null)
+            {
+                drawingContext.FillRectange(background, new Rect(this.ActualSize));
+            }
+
+            if (source != null)
+            {
+                Rect viewPort = new Rect(this.ActualSize);
+                Size sourceSize = new Size(source.PixelWidth, source.PixelHeight);
+                Vector scale = CalculateScaling(this.ActualSize, sourceSize, this.Stretch);
+                Size scaledSize = sourceSize * scale;
+                Rect destRect = viewPort
+                    .Center(new Rect(scaledSize))
+                    .Intersect(viewPort);
+                Rect sourceRect = new Rect(sourceSize)
+                    .Center(new Rect(destRect.Size / scale));
+
+                drawingContext.DrawImage(source, 1, sourceRect, destRect);
+            }
+        }
+
+        private static Vector CalculateScaling(Size availableSize, Size imageSize, Stretch stretch)
+        {
+            double scaleX = 1;
+            double scaleY = 1;
+
+            if (stretch != Stretch.None)
+            {
+                scaleX = availableSize.Width / imageSize.Width;
+                scaleY = availableSize.Height / imageSize.Height;
+
+                switch (stretch)
+                {
+                    case Stretch.Uniform:
+                        scaleX = scaleY = Math.Min(scaleX, scaleY);
+                        break;
+                    case Stretch.UniformToFill:
+                        scaleX = scaleY = Math.Max(scaleX, scaleY);
+                        break;
+                }
+            }
+
+            return new Vector(scaleX, scaleY);
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            double width = 0;
+            double height = 0;
+            Vector scale = new Vector();
+
+            if (this.Source != null)
+            {
+                width = this.Source.PixelWidth;
+                height = this.Source.PixelHeight;
+
+                if (this.Width > 0)
+                {
+                    availableSize = new Size(this.Width, availableSize.Height);
+                }
+
+                if (this.Height > 0)
+                {
+                    availableSize = new Size(availableSize.Width, this.Height);
+                }
+
+                scale = CalculateScaling(availableSize, new Size(width, height), this.Stretch);
+            }
+
+            return new Size(width * scale.X, height * scale.Y);
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            return finalSize;
+        }
+    }
+}

Perspex.Controls/ItemsControl.cs

@@ -0,0 +1,137 @@
+// -----------------------------------------------------------------------
+// <copyright file="ItemsControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Collections.Specialized;
+    using System.ComponentModel;
+    using System.Linq;
+
+    public class ItemsControl : TemplatedControl
+    {
+        private static readonly ItemsPanelTemplate DefaultPanel =
+            new ItemsPanelTemplate(() => new StackPanel { Orientation = Orientation.Vertical });
+
+        public static readonly PerspexProperty<IEnumerable> ItemsProperty =
+            PerspexProperty.Register<ItemsControl, IEnumerable>("Items");
+
+        public static readonly PerspexProperty<ItemsPanelTemplate> ItemsPanelProperty =
+            PerspexProperty.Register<ItemsControl, ItemsPanelTemplate>("ItemsPanel", defaultValue: DefaultPanel);
+
+        private Dictionary<object, Control> controlsByItem = new Dictionary<object, Control>();
+
+        private Dictionary<Control, object> itemsByControl = new Dictionary<Control, object>();
+
+        public ItemsControl()
+        {
+            this.GetObservableWithHistory(ItemsProperty).Subscribe(this.ItemsChanged);
+        }
+
+        public IEnumerable Items
+        {
+            get { return this.GetValue(ItemsProperty); }
+            set { this.SetValue(ItemsProperty, value); }
+        }
+
+        public ItemsPanelTemplate ItemsPanel
+        {
+            get { return this.GetValue(ItemsPanelProperty); }
+            set { this.SetValue(ItemsPanelProperty, value); }
+        }
+
+        public Control GetControlForItem(object item)
+        {
+            Control result;
+            this.controlsByItem.TryGetValue(item, out result);
+            return result;
+        }
+
+        public object GetItemForControl(Control control)
+        {
+            object result;
+            this.itemsByControl.TryGetValue(control, out result);
+            return result;
+        }
+
+        public IEnumerable<Control> GetAllItemControls()
+        {
+            return this.controlsByItem.Values;
+        }
+
+        internal Control CreateItemControl(object item)
+        {
+            Control control = this.CreateItemControlOverride(item);
+            this.itemsByControl.Add(control, item);
+            this.controlsByItem.Add(item, control);
+            return control;
+        }
+
+        internal void RemoveItemControls(IEnumerable items)
+        {
+            foreach (object i in items)
+            {
+                Control control = this.GetControlForItem(i);
+                this.controlsByItem.Remove(i);
+                this.itemsByControl.Remove(control);
+            }
+        }
+
+        internal void ClearItemControls()
+        {
+            this.controlsByItem.Clear();
+            this.itemsByControl.Clear();
+        }
+
+        protected virtual Control CreateItemControlOverride(object item)
+        {
+            return (item as Control) ?? this.GetDataTemplate(item).Build(item);
+        }
+
+        private void ItemsChanged(Tuple<IEnumerable, IEnumerable> value)
+        {
+            INotifyPropertyChanged inpc = value.Item1 as INotifyPropertyChanged;
+
+            if (inpc != null)
+            {
+                inpc.PropertyChanged -= ItemsPropertyChanged;
+            }
+
+            if (value.Item2 == null || !value.Item2.OfType<object>().Any())
+            {
+                this.Classes.Add(":empty");
+            }
+            else
+            {
+                this.Classes.Remove(":empty");
+            }
+
+            inpc = value.Item2 as INotifyPropertyChanged;
+
+            if (inpc != null)
+            {
+                inpc.PropertyChanged += ItemsPropertyChanged;
+            }
+        }
+
+        private void ItemsPropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == "Count")
+            {
+                if (((IList)sender).Count == 0)
+                {
+                    this.Classes.Add(":empty");
+                }
+                else
+                {
+                    this.Classes.Remove(":empty");
+                }
+            }
+        }
+    }
+}

Perspex.Controls/ItemsPanelTemplate.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Perspex.Controls
+{
+    public class ItemsPanelTemplate
+    {
+        public ItemsPanelTemplate(Func<Panel> build)
+        {
+            Contract.Requires<ArgumentNullException>(build != null);
+
+            this.Build = build;
+        }
+
+        public Func<Panel> Build { get; private set; }
+    }
+}

Perspex.Controls/ItemsPresenter.cs

@@ -0,0 +1,178 @@
+// -----------------------------------------------------------------------
+// <copyright file="ItemsControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Collections.Specialized;
+    using System.Linq;
+
+    public class ItemsPresenter : Control, IVisual
+    {
+        public static readonly PerspexProperty<IEnumerable> ItemsProperty =
+            ItemsControl.ItemsProperty.AddOwner<ItemsPresenter>();
+
+        public static readonly PerspexProperty<ItemsPanelTemplate> ItemsPanelProperty =
+            ItemsControl.ItemsPanelProperty.AddOwner<ItemsPresenter>();
+
+        private Panel panel;
+
+        public ItemsPresenter()
+        {
+            this.GetObservableWithHistory(ItemsProperty).Subscribe(this.ItemsChanged);
+        }
+
+        public IEnumerable Items
+        {
+            get { return this.GetValue(ItemsProperty); }
+            set { this.SetValue(ItemsProperty, value); }
+        }
+
+        public ItemsPanelTemplate ItemsPanel
+        {
+            get { return this.GetValue(ItemsPanelProperty); }
+            set { this.SetValue(ItemsPanelProperty, value); }
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            Panel panel = this.GetPanel();
+            panel.Measure(availableSize);
+            return panel.DesiredSize.Value;
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            this.GetPanel().Arrange(new Rect(finalSize));
+            return finalSize;
+        }
+
+        private Control CreateItemControl(object item)
+        {
+            ItemsControl i = this.TemplatedParent as ItemsControl;
+
+            if (i != null)
+            {
+                return i.CreateItemControl(item);
+            }
+            else
+            {
+                return this.GetDataTemplate(item).Build(item) as Control;
+            }
+        }
+         
+        private IEnumerable<Control> CreateItemControls(IEnumerable items)
+        {
+            if (items != null)
+            {
+                return items
+                    .Cast<object>()
+                    .Select(x => this.CreateItemControl(x))
+                    .OfType<Control>();
+            }
+            else
+            {
+                return Enumerable.Empty<Control>();
+            }
+        }
+
+        private void ClearItemControls()
+        {
+            ItemsControl i = this.TemplatedParent as ItemsControl;
+
+            if (i != null)
+            {
+                i.ClearItemControls();
+            }
+        }
+
+        private void RemoveItemControls(IEnumerable items)
+        {
+            ItemsControl i = this.TemplatedParent as ItemsControl;
+
+            if (i != null)
+            {
+                i.RemoveItemControls(items);
+            }
+        }
+
+        private Panel GetPanel()
+        {
+            if (this.panel == null && this.ItemsPanel != null)
+            {
+                this.panel = this.ItemsPanel.Build();
+                this.ItemsChanged(Tuple.Create(default(IEnumerable), this.Items));
+            }
+
+            return this.panel;
+        }
+
+        private void ItemsChanged(Tuple<IEnumerable, IEnumerable> value)
+        {
+            if (value.Item1 != null)
+            {
+                INotifyCollectionChanged incc = value.Item1 as INotifyCollectionChanged;
+
+                if (incc != null)
+                {
+                    incc.CollectionChanged -= this.ItemsCollectionChanged;
+                }
+            }
+
+            this.ClearItemControls();
+
+            if (this.panel != null)
+            {
+                var controls = this.CreateItemControls(value.Item2).ToList();
+
+                foreach (var control in controls)
+                {
+                    control.TemplatedParent = null;
+                }
+
+                this.panel.Children = new Controls(controls);
+
+                INotifyCollectionChanged incc = value.Item2 as INotifyCollectionChanged;
+
+                if (incc != null)
+                {
+                    incc.CollectionChanged += this.ItemsCollectionChanged;
+                }
+            }
+        }
+
+        private void ItemsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (this.panel != null)
+            {
+                // TODO: Handle Move and Replace.
+                switch (e.Action)
+                {
+                    case NotifyCollectionChangedAction.Add:
+                        var controls = this.CreateItemControls(e.NewItems).ToList();
+
+                        foreach (var control in controls)
+                        {
+                            control.TemplatedParent = null;
+                        }
+
+                        this.panel.Children.AddRange(controls);
+                        break;
+
+                    case NotifyCollectionChangedAction.Remove:
+                        this.RemoveItemControls(e.OldItems);
+                        break;
+                        
+                    case NotifyCollectionChangedAction.Reset:
+                        this.ItemsChanged(Tuple.Create(this.Items, this.Items));
+                        break;
+                }
+            }
+        }
+    }
+}

Perspex.Controls/Panel.cs

@@ -0,0 +1,45 @@
+// -----------------------------------------------------------------------
+// <copyright file="Panel.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    /// <summary>
+    /// Base class for controls that can contain multiple children.
+    /// </summary>
+    public class Panel : Control
+    {
+        private Controls children;
+
+        public Controls Children
+        {
+            get
+            {
+                if (this.children == null)
+                {
+                    this.children = new Controls();
+                }
+
+                return this.children;
+            }
+            
+            set
+            {
+                Contract.Requires<ArgumentNullException>(value != null);
+
+                if (this.children != value)
+                {
+                    this.children = value;
+                    this.ClearVisualChildren();
+                    this.AddVisualChildren(value);
+                }
+            }
+        }
+    }
+}

Perspex.Controls/Perspex.Controls.csproj

@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{D2221C82-4A25-4583-9B43-D791E3F6820C}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Perspex.Controls</RootNamespace>
+    <AssemblyName>Perspex.Controls</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile7</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Border.cs" />
+    <Compile Include="Button.cs" />
+    <Compile Include="CheckBox.cs" />
+    <Compile Include="ColumnDefinition.cs" />
+    <Compile Include="ColumnDefinitions.cs" />
+    <Compile Include="ContentControl.cs" />
+    <Compile Include="ContentPresenter.cs" />
+    <Compile Include="Control.cs" />
+    <Compile Include="ControlExtensions.cs" />
+    <Compile Include="Controls.cs" />
+    <Compile Include="ControlTemplate.cs" />
+    <Compile Include="DataTemplate.cs" />
+    <Compile Include="IGlobalDataTemplates.cs" />
+    <Compile Include="DataTemplates.cs" />
+    <Compile Include="Decorator.cs" />
+    <Compile Include="DefinitionBase.cs" />
+    <Compile Include="Grid.cs" />
+    <Compile Include="GridLength.cs" />
+    <Compile Include="HeaderedContentControl.cs" />
+    <Compile Include="HeaderedItemsControl.cs" />
+    <Compile Include="IHeadered.cs" />
+    <Compile Include="Image.cs" />
+    <Compile Include="ItemsControl.cs" />
+    <Compile Include="ItemsPanelTemplate.cs" />
+    <Compile Include="ItemsPresenter.cs" />
+    <Compile Include="Panel.cs" />
+    <Compile Include="RowDefinition.cs" />
+    <Compile Include="RowDefinitions.cs" />
+    <Compile Include="SelectingItemsControl.cs" />
+    <Compile Include="StackPanel.cs" />
+    <Compile Include="TabControl.cs" />
+    <Compile Include="TabItem.cs" />
+    <Compile Include="TabStrip.cs" />
+    <Compile Include="TemplatedControl.cs" />
+    <Compile Include="TextBlock.cs" />
+    <Compile Include="TextBox.cs" />
+    <Compile Include="TextBoxView.cs" />
+    <Compile Include="ToggleButton.cs" />
+    <Compile Include="TreeDataTemplate.cs" />
+    <Compile Include="TreeView.cs" />
+    <Compile Include="TreeViewItem.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="Splat">
+      <HintPath>..\packages\Splat.1.3.3\lib\Portable-net45+win+wpa81+wp80\Splat.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Core">
+      <HintPath>..\packages\Rx-Core.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>..\packages\Rx-Interfaces.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Linq">
+      <HintPath>..\packages\Rx-Linq.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Linq.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Perspex.Base\Perspex.Base.csproj">
+      <Project>{b09b78d8-9b26-48b0-9149-d64a2f120f3f}</Project>
+      <Name>Perspex.Base</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Input\Perspex.Input.csproj">
+      <Project>{62024b2d-53eb-4638-b26b-85eeaa54866e}</Project>
+      <Name>Perspex.Input</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Interactivity\Perspex.Interactivity.csproj">
+      <Project>{6b0ed19d-a08b-461c-a9d9-a9ee40b0c06b}</Project>
+      <Name>Perspex.Interactivity</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Layout\Perspex.Layout.csproj">
+      <Project>{42472427-4774-4c81-8aff-9f27b8e31721}</Project>
+      <Name>Perspex.Layout</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.SceneGraph\Perspex.SceneGraph.csproj">
+      <Project>{eb582467-6abb-43a1-b052-e981ba910e3a}</Project>
+      <Name>Perspex.SceneGraph</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Styling\Perspex.Styling.csproj">
+      <Project>{f1baa01a-f176-4c6a-b39d-5b40bb1b148f}</Project>
+      <Name>Perspex.Styling</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <Import Project="..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets" Condition="Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets'))" />
+  </Target>
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Perspex.Controls/Properties/AssemblyInfo.cs

@@ -0,0 +1,30 @@
+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Perspex.Controls")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Perspex.Controls")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Perspex.Controls/RowDefinition.cs

@@ -0,0 +1,53 @@
+// -----------------------------------------------------------------------
+// <copyright file="RowDefinition.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class RowDefinition : DefinitionBase
+    {
+        public static readonly PerspexProperty<double> MaxHeightProperty =
+            PerspexProperty.Register<RowDefinition, double>("MaxHeight", double.PositiveInfinity);
+
+        public static readonly PerspexProperty<double> MinHeightProperty =
+            PerspexProperty.Register<RowDefinition, double>("MinHeight");
+
+        public static readonly PerspexProperty<GridLength> HeightProperty =
+            PerspexProperty.Register<RowDefinition, GridLength>("Height", new GridLength(1, GridUnitType.Star));
+
+        public RowDefinition()
+        {
+        }
+
+        public RowDefinition(GridLength height)
+        {
+            this.Height = height;
+        }
+
+        public double ActualHeight
+        {
+            get;
+            internal set;
+        }
+
+        public double MaxHeight
+        {
+            get { return this.GetValue(MaxHeightProperty); }
+            set { this.SetValue(MaxHeightProperty, value); }
+        }
+
+        public double MinHeight
+        {
+            get { return this.GetValue(MinHeightProperty); }
+            set { this.SetValue(MinHeightProperty, value); }
+        }
+
+        public GridLength Height
+        {
+            get { return this.GetValue(HeightProperty); }
+            set { this.SetValue(HeightProperty, value); }
+        }
+    }
+}

Perspex.Controls/RowDefinitions.cs

@@ -0,0 +1,12 @@
+// -----------------------------------------------------------------------
+// <copyright file="RowDefinitions.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class RowDefinitions : PerspexList<RowDefinition>
+    {
+    }
+}

Perspex.Controls/SelectingItemsControl.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="SelectingItemsControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class SelectingItemsControl : ItemsControl
+    {
+        public static readonly PerspexProperty<object> SelectedItemProperty =
+            PerspexProperty.Register<SelectingItemsControl, object>("SelectedItem");
+
+        public object SelectedItem
+        {
+            get { return this.GetValue(SelectedItemProperty); }
+            set { this.SetValue(SelectedItemProperty, value); }
+        }
+    }
+}

Perspex.Controls/StackPanel.cs

@@ -0,0 +1,155 @@
+// -----------------------------------------------------------------------
+// <copyright file="StackPanel.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Text;
+    using System.Threading.Tasks;
+
+    public enum Orientation
+    {
+        Vertical,
+        Horizontal,
+    }
+
+    public class StackPanel : Panel
+    {
+        public static readonly PerspexProperty<double> GapProperty =
+            PerspexProperty.Register<StackPanel, double>("Gap");
+
+        public static readonly PerspexProperty<Orientation> OrientationProperty =
+            PerspexProperty.Register<StackPanel, Orientation>("Orientation");
+
+        public double Gap
+        {
+            get { return this.GetValue(GapProperty); }
+            set { this.SetValue(GapProperty, value); }
+        }
+
+        public Orientation Orientation
+        {
+            get { return this.GetValue(OrientationProperty); }
+            set { this.SetValue(OrientationProperty, value); }
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            double childAvailableWidth = double.PositiveInfinity;
+            double childAvailableHeight = double.PositiveInfinity;
+
+            if (this.Orientation == Orientation.Vertical)
+            {
+                childAvailableWidth = availableSize.Width;
+
+                if (!double.IsNaN(this.Width))
+                {
+                    childAvailableWidth = this.Width;
+                }
+
+                childAvailableWidth = Math.Min(childAvailableWidth, this.MaxWidth);
+                childAvailableWidth = Math.Max(childAvailableWidth, this.MinWidth);
+            }
+            else
+            {
+                childAvailableHeight = availableSize.Height;
+
+                if (!double.IsNaN(this.Height))
+                {
+                    childAvailableHeight = this.Height;
+                }
+
+                childAvailableHeight = Math.Min(childAvailableHeight, this.MaxHeight);
+                childAvailableHeight = Math.Max(childAvailableHeight, this.MinHeight);
+            }
+
+            double measuredWidth = 0;
+            double measuredHeight = 0;
+            double gap = this.Gap;
+
+            foreach (Control child in this.Children)
+            {
+                child.Measure(new Size(childAvailableWidth, childAvailableHeight));
+                Size size = child.DesiredSize.Value;
+
+                if (Orientation == Orientation.Vertical)
+                {
+                    measuredHeight += size.Height + gap;
+                    measuredWidth = Math.Max(measuredWidth, size.Width);
+                }
+                else
+                {
+                    measuredWidth += size.Width + gap;
+                    measuredHeight = Math.Max(measuredHeight, size.Height);
+                }
+            }
+
+            return new Size(measuredWidth, measuredHeight);
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            double arrangedWidth = finalSize.Width;
+            double arrangedHeight = finalSize.Height;
+            double gap = this.Gap;
+
+            if (Orientation == Orientation.Vertical)
+            {
+                arrangedHeight = 0;
+            }
+            else
+            {
+                arrangedWidth = 0;
+            }
+
+            foreach (Control child in this.Children.Where(x => x.DesiredSize.HasValue))
+            {
+                double childWidth = child.DesiredSize.Value.Width;
+                double childHeight = child.DesiredSize.Value.Height;
+
+                if (Orientation == Orientation.Vertical)
+                {
+                    childWidth = finalSize.Width;
+
+                    Rect childFinal = new Rect(0, arrangedHeight, childWidth, childHeight);
+
+                    if (childFinal.IsEmpty)
+                    {
+                        child.Arrange(new Rect());
+                    }
+                    else
+                    {
+                        child.Arrange(childFinal);
+                    }
+
+                    arrangedWidth = Math.Max(arrangedWidth, childWidth);
+                    arrangedHeight += childHeight + gap;
+                }
+                else
+                {
+                    childHeight = finalSize.Height;
+                    Rect childFinal = new Rect(arrangedWidth, 0, childWidth, childHeight);
+                    child.Arrange(childFinal);
+                    arrangedWidth += childWidth + gap;
+                    arrangedHeight = Math.Max(arrangedHeight, childHeight);
+                }
+            }
+
+            if (Orientation == Orientation.Vertical)
+            {
+                arrangedHeight = Math.Max(arrangedHeight - gap, finalSize.Height);
+            }
+            else
+            {
+                arrangedWidth = Math.Max(arrangedWidth - gap, finalSize.Width);
+            }
+
+            return new Size(arrangedWidth, arrangedHeight);
+        }
+    }
+}

Perspex.Controls/TabControl.cs

@@ -0,0 +1,62 @@
+// -----------------------------------------------------------------------
+// <copyright file="TabControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive.Linq;
+
+    public class TabControl : SelectingItemsControl
+    {
+        public static readonly PerspexProperty<object> SelectedContentProperty =
+            PerspexProperty.Register<TabControl, object>("SelectedContent");
+
+        private TabStrip tabStrip;
+
+        public TabControl()
+        {
+            this.GetObservable(SelectedItemProperty).Skip(1).Subscribe(this.SelectedItemChanged);
+        }
+
+        protected override void OnTemplateApplied()
+        {
+            this.tabStrip = this.GetTemplateControls()
+                .OfType<TabStrip>()
+                .FirstOrDefault();
+
+            if (this.tabStrip != null)
+            {
+                if (this.IsSet(SelectedItemProperty))
+                {
+                    this.SelectedItem = SelectedItem;
+                }
+
+                this.tabStrip.GetObservable(TabStrip.SelectedItemProperty).Subscribe(x =>
+                {
+                    this.SelectedItem = x;
+                });
+            }
+        }
+
+        private void SelectedItemChanged(object item)
+        {
+            this.SelectedItem = item;
+
+            ContentControl content = item as ContentControl;
+
+            if (content != null)
+            {
+                this.SetValue(SelectedContentProperty, content.Content);
+            }
+            else
+            {
+                this.SetValue(SelectedContentProperty, item);
+            }
+        }
+    }
+}

Perspex.Controls/TabItem.cs

@@ -0,0 +1,26 @@
+// -----------------------------------------------------------------------
+// <copyright file="TabItem.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public class TabItem : HeaderedContentControl
+    {
+        public static readonly PerspexProperty<bool> IsSelectedProperty =
+            PerspexProperty.Register<TabItem, bool>("IsSelected");
+
+        public TabItem()
+        {
+            this.AddPseudoClass(IsSelectedProperty, ":selected");
+            AffectsRender(IsSelectedProperty);
+        }
+
+        public bool IsSelected
+        {
+            get { return this.GetValue(IsSelectedProperty); }
+            set { this.SetValue(IsSelectedProperty, value); }
+        }
+    }
+}

Perspex.Controls/TabStrip.cs

@@ -0,0 +1,88 @@
+// -----------------------------------------------------------------------
+// <copyright file="TabStrip.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Linq;
+    using Perspex.Input;
+
+    public class TabStrip : SelectingItemsControl
+    {
+        private static readonly ItemsPanelTemplate PanelTemplate = new ItemsPanelTemplate(
+            () => new StackPanel());
+
+        static TabStrip()
+        {
+            ItemsPanelProperty.OverrideDefaultValue(typeof(TabStrip), PanelTemplate);
+        }
+
+        public TabStrip()
+        {
+            this.PointerPressed += this.OnPointerPressed;
+            this.GetObservable(ItemsProperty).Subscribe(this.ItemsChanged);
+            this.GetObservable(SelectedItemProperty).Subscribe(this.SelectedItemChanged);
+        }
+
+        protected override Control CreateItemControlOverride(object item)
+        {
+            TabItem result = item as TabItem;
+
+            if (result == null)
+            {
+                result = new TabItem
+                {
+                    Content = this.GetDataTemplate(item).Build(item),
+                };
+            }
+
+            result.IsSelected = this.SelectedItem == item;
+
+            return result;
+        }
+
+        private void ItemsChanged(IEnumerable items)
+        {
+            if (items != null)
+            {
+                this.SelectedItem =
+                    items.OfType<TabItem>().FirstOrDefault(x => x.IsSelected) ??
+                    items.OfType<object>().FirstOrDefault();
+            }
+            else
+            {
+                this.SelectedItem = null;
+            }
+        }
+
+        private void OnPointerPressed(object sender, PointerEventArgs e)
+        {
+            IVisual source = (IVisual)e.Source;
+            ContentPresenter presenter = source.GetVisualAncestors()
+                .OfType<ContentPresenter>()
+                .FirstOrDefault();
+
+            if (presenter !=  null)
+            {
+                TabItem item = presenter.TemplatedParent as TabItem;
+
+                if (item != null)
+                {
+                    this.SelectedItem = item;
+                }
+            }
+        }
+
+        private void SelectedItemChanged(object selectedItem)
+        {
+            foreach (TabItem item in this.GetAllItemControls())
+            {
+                item.IsSelected = item == selectedItem;
+            }
+        }
+    }
+}

Perspex.Controls/TemplatedControl.cs

@@ -0,0 +1,74 @@
+// -----------------------------------------------------------------------
+// <copyright file="TemplatedControl.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using Perspex.Media;
+    using Perspex.Styling;
+    using Splat;
+
+    public class TemplatedControl : Control, IVisual, ITemplatedControl
+    {
+        public static readonly PerspexProperty<ControlTemplate> TemplateProperty =
+            PerspexProperty.Register<TemplatedControl, ControlTemplate>("Template");
+
+        public ControlTemplate Template
+        {
+            get { return this.GetValue(TemplateProperty); }
+            set { this.SetValue(TemplateProperty, value); }
+        }
+
+        public sealed override void Render(IDrawingContext context)
+        {
+        }
+
+        protected override Size ArrangeOverride(Size finalSize)
+        {
+            Control child = ((IVisual)this).VisualChildren.SingleOrDefault() as Control;
+
+            if (child != null)
+            {
+                child.Arrange(new Rect(finalSize));
+                return child.ActualSize;
+            }
+            else
+            {
+                return new Size();
+            }
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            Control child = ((IVisual)this).VisualChildren.SingleOrDefault() as Control;
+
+            if (child != null)
+            {
+                child.Measure(availableSize);
+                return child.DesiredSize.Value;
+            }
+
+            return new Size();
+        }
+
+        protected override IEnumerable<Visual> CreateVisualChildren()
+        {
+            this.Log().Debug(string.Format(
+                "Creating template for {0} (#{1:x8})",
+                this.GetType().Name,
+                this.GetHashCode()));
+
+            var child = this.Template.Build(this);
+            return Enumerable.Repeat(child, 1);
+        }
+
+        protected virtual void OnTemplateApplied()
+        {
+        }
+    }
+}

Perspex.Controls/TextBlock.cs

@@ -0,0 +1,66 @@
+// -----------------------------------------------------------------------
+// <copyright file="TextBlock.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using Perspex.Media;
+    using Perspex.Platform;
+    using Splat;
+
+    public class TextBlock : Control
+    {
+        public static readonly PerspexProperty<string> TextProperty =
+            PerspexProperty.Register<TextBlock, string>("Text");
+
+        static TextBlock()
+        {
+            AffectsMeasure(TextProperty);
+        }
+
+        public string Text
+        {
+            get { return this.GetValue(TextProperty); }
+            set { this.SetValue(TextProperty, value); }
+        }
+
+        private FormattedText FormattedText
+        {
+            get
+            {
+                return new FormattedText
+                {
+                    FontFamilyName = "Segoe UI",
+                    FontSize = this.FontSize,
+                    Text = this.Text,
+                };
+            }
+        }
+
+        public override void Render(IDrawingContext context)
+        {
+            Brush background = this.Background;
+
+            if (background != null)
+            {
+                context.FillRectange(background, new Rect(this.ActualSize));
+            }
+
+            context.DrawText(this.Foreground, new Rect(this.ActualSize), this.FormattedText);
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            if (!string.IsNullOrEmpty(this.Text))
+            {
+                ITextService textService = Locator.Current.GetService<ITextService>();
+                return textService.Measure(this.FormattedText, availableSize);
+            }
+
+            return new Size();
+        }
+    }
+}

Perspex.Controls/TextBox.cs

@@ -0,0 +1,133 @@
+// -----------------------------------------------------------------------
+// <copyright file="TextBox.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Linq;
+    using Perspex.Input;
+    using Perspex.Platform;
+    using Perspex.Styling;
+    using Splat;
+
+    public class TextBox : TemplatedControl
+    {
+        public static readonly PerspexProperty<string> TextProperty =
+            TextBlock.TextProperty.AddOwner<TextBox>();
+
+        private int caretIndex;
+
+        private TextBoxView textBoxView;
+
+        static TextBox()
+        {
+            FocusableProperty.OverrideDefaultValue(typeof(TextBox), true);
+        }
+
+        public TextBox()
+        {
+            this.GotFocus += (s, e) => this.textBoxView.GotFocus();
+            this.LostFocus += (s, e) => this.textBoxView.LostFocus();
+            this.KeyDown += this.OnKeyDown;
+            this.PointerPressed += this.OnPointerPressed;
+        }
+
+        public int CaretIndex
+        {
+            get
+            {
+                return this.caretIndex;
+            }
+
+            set
+            {
+                value = Math.Min(Math.Max(value, 0), this.Text.Length);
+
+                if (this.caretIndex != value)
+                {
+                    this.caretIndex = value;
+                    this.textBoxView.CaretMoved();
+                }
+            }
+        }
+
+        public string Text
+        {
+            get { return this.GetValue(TextProperty); }
+            set { this.SetValue(TextProperty, value); }
+        }
+
+        protected override void OnTemplateApplied()
+        {
+            Decorator textContainer = this.GetVisualDescendents()
+                .OfType<Decorator>()
+                .FirstOrDefault(x => x.Id == "textContainer");
+
+            if (textContainer == null)
+            {
+                throw new Exception(
+                    "TextBox template doesn't contain a textContainer " +
+                    "or textContainer is not a Decorator.");
+            }
+
+            textContainer.Content = this.textBoxView = new TextBoxView(this);
+            this.GetObservable(TextProperty).Subscribe(_ => this.textBoxView.InvalidateText());
+        }
+
+        private void OnKeyDown(object sender, KeyEventArgs e)
+        {
+            string text = this.Text;
+
+            switch (e.Key)
+            {
+                case Key.Left:
+                    --this.CaretIndex;
+                    break;
+
+                case Key.Right:
+                    ++this.CaretIndex;
+                    break;
+
+                case Key.Back:
+                    if (this.caretIndex > 0)
+                    {
+                        this.Text = text.Substring(0, this.caretIndex - 1) + text.Substring(this.caretIndex);
+                        --this.CaretIndex;
+                    }
+
+                    break;
+
+                case Key.Delete:
+                    if (this.caretIndex < text.Length)
+                    {
+                        this.Text = text.Substring(0, this.caretIndex) + text.Substring(this.caretIndex + 1);
+                    }
+
+                    break;
+
+                default:
+                    if (!string.IsNullOrEmpty(e.Text))
+                    {
+                        this.Text = text.Substring(0, this.caretIndex) + e.Text + text.Substring(this.caretIndex);
+                        ++this.CaretIndex;
+                    }
+
+                    break;
+            }
+
+            e.Handled = true;
+        }
+
+        private void OnPointerPressed(object sender, PointerEventArgs e)
+        {
+            IPlatformRenderInterface platform = Locator.Current.GetService<IPlatformRenderInterface>();
+            this.CaretIndex = platform.TextService.GetCaretIndex(
+                this.textBoxView.FormattedText,
+                e.GetPosition(this.textBoxView),
+                this.ActualSize);
+        }
+    }
+}

Perspex.Controls/TextBoxView.cs

@@ -0,0 +1,125 @@
+// -----------------------------------------------------------------------
+// <copyright file="TextBoxView.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using Perspex.Media;
+    using Perspex.Platform;
+    using Perspex.Threading;
+    using Splat;
+
+    internal class TextBoxView : Control
+    {
+        private TextBox parent;
+
+        private FormattedText formattedText;
+
+        private DispatcherTimer caretTimer;
+
+        private bool caretBlink;
+
+        public TextBoxView(TextBox parent)
+        {
+            this.caretTimer = new DispatcherTimer();
+            this.caretTimer.Interval = TimeSpan.FromMilliseconds(500);
+            this.caretTimer.Tick += this.CaretTimerTick;
+            this.parent = parent;
+        }
+
+        public FormattedText FormattedText
+        {
+            get
+            {
+                if (this.formattedText == null)
+                {
+                    this.formattedText = this.CreateFormattedText();
+                }
+
+                return this.formattedText;
+            }
+        }
+
+        public new void GotFocus()
+        {
+            this.caretBlink = true;
+            this.caretTimer.Start();
+        }
+
+        public new void LostFocus()
+        {
+            this.caretTimer.Stop();
+            this.InvalidateVisual();
+        }
+
+        public void InvalidateText()
+        {
+            this.formattedText = null;
+            this.InvalidateMeasure();
+        }
+
+        internal void CaretMoved()
+        {
+            this.caretBlink = true;
+            this.caretTimer.Stop();
+            this.caretTimer.Start();
+            this.InvalidateVisual();
+        }
+
+        public override void Render(IDrawingContext context)
+        {
+            Rect rect = new Rect(this.ActualSize);
+
+            context.DrawText(Brushes.Black, rect, this.FormattedText);
+
+            if (this.parent.IsFocused)
+            {
+                ITextService textService = Locator.Current.GetService<ITextService>();
+                Point caretPos = textService.GetCaretPosition(
+                    this.formattedText, 
+                    this.parent.CaretIndex,
+                    this.ActualSize);
+                double[] lineHeights = textService.GetLineHeights(this.formattedText, this.ActualSize);
+                Brush caretBrush = Brushes.Black;
+
+                if (this.caretBlink)
+                {
+                    context.DrawLine(
+                        new Pen(caretBrush, 1),
+                        caretPos,
+                        new Point(caretPos.X, caretPos.Y + lineHeights[0]));
+                }
+            }
+        }
+
+        protected override Size MeasureOverride(Size constraint)
+        {
+            if (!string.IsNullOrEmpty(this.parent.Text))
+            {
+                ITextService textService = Locator.Current.GetService<ITextService>();
+                return textService.Measure(this.FormattedText, constraint);
+            }
+
+            return new Size();
+        }
+
+        private FormattedText CreateFormattedText()
+        {
+            return new FormattedText
+            {
+                FontFamilyName = "Segoe UI",
+                FontSize = this.FontSize,
+                Text = this.parent.Text,
+            };
+        }
+
+        private void CaretTimerTick(object sender, EventArgs e)
+        {
+            this.caretBlink = !this.caretBlink;
+            this.InvalidateVisual();
+        }
+    }
+}

Perspex.Controls/ToggleButton.cs

@@ -0,0 +1,28 @@
+// -----------------------------------------------------------------------
+// <copyright file="ToggleButton.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+
+    public class ToggleButton : Button
+    {
+        public static readonly PerspexProperty<bool> IsCheckedProperty =
+            PerspexProperty.Register<ToggleButton, bool>("IsChecked");
+
+        public ToggleButton()
+        {
+            this.Click += (s, e) => this.IsChecked = !this.IsChecked;
+            this.AddPseudoClass(IsCheckedProperty, ":checked");
+        }
+
+        public bool IsChecked
+        {
+            get { return this.GetValue(IsCheckedProperty); }
+            set { this.SetValue(IsCheckedProperty, value); }
+        }
+    }
+}

Perspex.Controls/TreeDataTemplate.cs

@@ -0,0 +1,107 @@
+// -----------------------------------------------------------------------
+// <copyright file="TreeDataTemplate.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+
+    public class TreeDataTemplate : DataTemplate
+    {
+        public TreeDataTemplate(
+            Func<object, Control> build, 
+            Func<object, IEnumerable> itemsSelector)
+            : this(o => true, build, itemsSelector)
+        {
+        }
+
+        public TreeDataTemplate(
+            Type type, 
+            Func<object, Control> build,
+            Func<object, IEnumerable> itemsSelector)
+            : this(o => IsInstance(o, type), build, itemsSelector)
+        {
+        }
+
+        public TreeDataTemplate(
+            Type type,
+            Func<object, Control> build,
+            Func<object, IEnumerable> itemsSelector,
+            Func<object, bool> isExpanded)
+            : this(o => IsInstance(o, type), build, itemsSelector, isExpanded)
+        {
+        }
+
+        public TreeDataTemplate(
+            Func<object, bool> match, 
+            Func<object, Control> build,
+            Func<object, IEnumerable> itemsSelector)
+            : this(match, build, itemsSelector, _ => false)
+        {
+            this.ItemsSelector = itemsSelector;
+        }
+
+        public TreeDataTemplate(
+            Func<object, bool> match,
+            Func<object, Control> build,
+            Func<object, IEnumerable> itemsSelector,
+            Func<object, bool> isExpanded)
+            : base(match, build)
+        {
+            this.ItemsSelector = itemsSelector;
+            this.IsExpanded = isExpanded;
+        }
+
+        public Func<object, IEnumerable> ItemsSelector { get; private set; }
+
+        public Func<object, bool> IsExpanded { get; private set; }
+    }
+
+    public class TreeDataTemplate<T> : TreeDataTemplate
+    {
+        public TreeDataTemplate(
+            Func<T, Control> build,
+            Func<T, IEnumerable> itemsSelector)
+            : base(typeof(T), Cast(build), Cast(itemsSelector))
+        {
+        }
+
+        public TreeDataTemplate(
+            Func<T, Control> build,
+            Func<T, IEnumerable> itemsSelector,
+            Func<T, bool> isExpanded)
+            : base(typeof(T), Cast(build), Cast(itemsSelector), Cast(isExpanded))
+        {
+        }
+
+        public TreeDataTemplate(
+            Func<T, bool> match, 
+            Func<T, Control> build,
+            Func<T, IEnumerable> itemsSelector)
+            : base(CastMatch(match), Cast(build), Cast(itemsSelector))
+        {
+        }
+
+        public TreeDataTemplate(
+            Func<T, bool> match,
+            Func<T, Control> build,
+            Func<T, IEnumerable> itemsSelector,
+            Func<T, bool> isExpanded)
+            : base(CastMatch(match), Cast(build), Cast(itemsSelector), Cast(isExpanded))
+        {
+        }
+
+        private static Func<object, bool> CastMatch(Func<T, bool> f)
+        {
+            return o => (o is T) ? f((T)o) : false;
+        }
+
+        private static Func<object, TResult> Cast<TResult>(Func<T, TResult> f)
+        {
+            return o => f((T)o);
+        }
+    }
+}

Perspex.Controls/TreeView.cs

@@ -0,0 +1,78 @@
+// -----------------------------------------------------------------------
+// <copyright file="TreeView.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System;
+    using System.Collections;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using Perspex.Input;
+
+    public class TreeView : SelectingItemsControl
+    {
+        public TreeView()
+        {
+            this.PointerPressed += this.OnPointerPressed;
+        }
+
+        protected override Control CreateItemControlOverride(object item)
+        {
+            TreeViewItem result = item as TreeViewItem;
+
+            if (result == null)
+            {
+                TreeDataTemplate template = this.GetTreeDataTemplate(item);
+
+                result = new TreeViewItem
+                {
+                    Header = template.Build(item),
+                    Items = template.ItemsSelector(item),
+                    IsExpanded = template.IsExpanded(item),
+                };
+            }
+
+            return result;
+        }
+
+        private TreeDataTemplate GetTreeDataTemplate(object item)
+        {
+            DataTemplate template = this.GetDataTemplate(item);
+            TreeDataTemplate treeTemplate = template as TreeDataTemplate;
+
+            if (treeTemplate == null)
+            {
+                treeTemplate = new TreeDataTemplate(template.Build, x => null);
+            }
+
+            return treeTemplate;
+        }
+
+        private void OnPointerPressed(object sender, PointerEventArgs e)
+        {
+            IVisual source = (IVisual)e.Source;
+            ContentPresenter contentPresenter = source.GetVisualAncestors()
+                .OfType<ContentPresenter>()
+                .FirstOrDefault();
+
+            if (contentPresenter != null)
+            {
+                TreeViewItem item = contentPresenter.TemplatedParent as TreeViewItem;
+
+                if (item != null)
+                {
+                    foreach (var i in this.GetVisualDescendents().OfType<TreeViewItem>())
+                    {
+                        i.IsSelected = i == item;
+                    }
+
+                    this.SelectedItem = this.GetItemForControl(item);
+                }
+            }
+
+        }
+    }
+}

Perspex.Controls/TreeViewItem.cs

@@ -0,0 +1,56 @@
+// -----------------------------------------------------------------------
+// <copyright file="TreeViewItem.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    using System.Linq;
+
+    public class TreeViewItem : HeaderedItemsControl
+    {
+        public static readonly PerspexProperty<bool> IsExpandedProperty =
+            PerspexProperty.Register<TreeViewItem, bool>("IsExpanded");
+
+        public static readonly PerspexProperty<bool> IsSelectedProperty =
+            PerspexProperty.Register<TreeViewItem, bool>("IsSelected");
+
+        TreeView parent;
+
+        public TreeViewItem()
+        {
+            this.AddPseudoClass(IsSelectedProperty, ":selected");
+            AffectsRender(IsSelectedProperty);
+        }
+
+        public bool IsExpanded
+        {
+            get { return this.GetValue(IsExpandedProperty); }
+            set { this.SetValue(IsExpandedProperty, value); }
+        }
+
+        public bool IsSelected
+        {
+            get { return this.GetValue(IsSelectedProperty); }
+            set { this.SetValue(IsSelectedProperty, value); }
+        }
+
+        protected override Control CreateItemControlOverride(object item)
+        {
+            if (this.parent != null)
+            {
+                return this.parent.CreateItemControl(item);
+            }
+            else
+            {
+                return null;
+            }
+        }
+
+        protected override void OnVisualParentChanged(IVisual oldParent)
+        {
+            this.parent = this.GetVisualAncestors().OfType<TreeView>().FirstOrDefault();
+        }
+    }
+}

Perspex.Controls/packages.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Rx-Core" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Interfaces" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Linq" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Main" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-PlatformServices" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Splat" version="1.3.3" targetFramework="portable-net45+win" />
+  <package id="StyleCop.MSBuild" version="4.7.49.0" targetFramework="portable-net45+win" developmentDependency="true" />
+</packages>

Perspex.Direct2D1.RenderTests/Perspex.Direct2D1.RenderTests.csproj

@@ -38,9 +38,9 @@
     <Reference Include="Magick.NET-x86">
       <HintPath>..\packages\Magick.NET-Q16-x86.6.8.9.101\lib\net40-client\Magick.NET-x86.dll</HintPath>
     </Reference>
-    <Reference Include="Splat, Version=1.1.1.0, Culture=neutral, processorArchitecture=MSIL">
+    <Reference Include="Splat, Version=1.3.3.0, Culture=neutral, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Splat.1.1.1\lib\Net45\Splat.dll</HintPath>
+      <HintPath>..\packages\Splat.1.3.3\lib\Net45\Splat.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Drawing" />

Perspex.Direct2D1.RenderTests/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Magick.NET-Q16-x86" version="6.8.9.101" targetFramework="net45" />
-  <package id="Splat" version="1.1.1" targetFramework="net45" />
+  <package id="Splat" version="1.3.3" targetFramework="net45" />
 </packages>

Perspex.Direct2D1/Perspex.Direct2D1.csproj

@@ -39,8 +39,9 @@
     <Reference Include="SharpDX.DXGI">
       <HintPath>..\packages\SharpDX.DXGI.2.5.0\lib\net40\SharpDX.DXGI.dll</HintPath>
     </Reference>
-    <Reference Include="Splat">
-      <HintPath>..\packages\Splat.1.1.1\lib\Net45\Splat.dll</HintPath>
+    <Reference Include="Splat, Version=1.3.3.0, Culture=neutral, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Splat.1.3.3\lib\Net45\Splat.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />

Perspex.Direct2D1/packages.config

@@ -6,5 +6,5 @@
   <package id="SharpDX" version="2.5.0" targetFramework="net45" />
   <package id="SharpDX.Direct2D1" version="2.5.0" targetFramework="net45" />
   <package id="SharpDX.DXGI" version="2.5.0" targetFramework="net45" />
-  <package id="Splat" version="1.1.1" targetFramework="net45" />
+  <package id="Splat" version="1.3.3" targetFramework="net45" />
 </packages>

Perspex.Input/FocusManager.cs

@@ -0,0 +1,47 @@
+// -----------------------------------------------------------------------
+// <copyright file="IFocusManager.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using Perspex.Interactivity;
+
+    public class FocusManager : IFocusManager
+    {
+        public IInputElement Current
+        {
+            get;
+            private set;
+        }
+
+        public void Focus(IInputElement control)
+        {
+            IInteractive current = this.Current as IInteractive;
+            IInteractive next = control as IInteractive;
+
+            if (current != null)
+            {
+                current.RaiseEvent(new RoutedEventArgs
+                {
+                    RoutedEvent = InputElement.LostFocusEvent,
+                    Source = current,
+                    OriginalSource = current,
+                });
+            }
+
+            this.Current = control;
+
+            if (next != null)
+            {
+                next.RaiseEvent(new RoutedEventArgs
+                {
+                    RoutedEvent = InputElement.GotFocusEvent,
+                    Source = next,
+                    OriginalSource = next,
+                });
+            }
+        }
+    }
+}

Perspex.Input/IFocusManager.cs

@@ -0,0 +1,21 @@
+// -----------------------------------------------------------------------
+// <copyright file="IFocusManager.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Text;
+    using System.Threading.Tasks;
+
+    public interface IFocusManager
+    {
+        IInputElement Current { get; }
+
+        void Focus(IInputElement focusable);
+    }
+}

Perspex.Input/IInputDevice.cs

@@ -0,0 +1,12 @@
+// -----------------------------------------------------------------------
+// <copyright file="IInputDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    public interface IInputDevice
+    {
+    }
+}

Perspex.Input/IInputElement.cs

@@ -0,0 +1,36 @@
+// -----------------------------------------------------------------------
+// <copyright file="IInputElement.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Interactivity;
+
+    public interface IInputElement : IInteractive
+    {
+        event EventHandler<RoutedEventArgs> GotFocus;
+
+        event EventHandler<RoutedEventArgs> LostFocus;
+
+        event EventHandler<KeyEventArgs> KeyDown;
+
+        event EventHandler<PointerEventArgs> PointerEnter;
+
+        event EventHandler<PointerEventArgs> PointerLeave;
+
+        event EventHandler<PointerEventArgs> PointerPressed;
+
+        event EventHandler<PointerEventArgs> PointerReleased;
+
+        bool Focusable { get; }
+
+        bool IsFocused { get; }
+
+        bool IsPointerOver { get; }
+
+        void Focus();
+    }
+}

Perspex.Input/IInputManager.cs

@@ -0,0 +1,21 @@
+// -----------------------------------------------------------------------
+// <copyright file="IInputManager.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Input.Raw;
+    using Perspex.Layout;
+
+    public interface IInputManager
+    {
+        IObservable<RawInputEventArgs> RawEventReceived { get; }
+
+        void Process(RawInputEventArgs e);
+
+        void SetPointerOver(IPointerDevice device, IVisual visual, Point p);
+    }
+}

Perspex.Input/IKeyboardDevice.cs

@@ -0,0 +1,33 @@
+// -----------------------------------------------------------------------
+// <copyright file="IKeyboardDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+
+    [Flags]
+    public enum ModifierKeys
+    {
+        None = 0,
+        Alt = 1,
+        Control = 2,
+        Shift = 4,
+        Windows = 8,
+    }
+
+    [Flags]
+    public enum KeyStates
+    {
+        None = 0,
+        Down = 1,
+        Toggled = 2,
+    }
+
+    public interface IKeyboardDevice : IInputDevice
+    {
+        ModifierKeys Modifiers { get; }
+    }
+}

Perspex.Input/IMouseDevice.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IMouseDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    public interface IMouseDevice : IPointerDevice
+    {
+        Point Position { get; }
+    }
+}

Perspex.Input/IPointerDevice.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="IPointerDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Interactivity;
+
+    public interface IPointerDevice : IInputDevice
+    {
+        IInteractive Captured { get; }
+
+        void Capture(IInteractive control);
+
+        Point GetPosition(IVisual relativeTo);
+    }
+}

Perspex.Input/InputElement.cs

@@ -0,0 +1,121 @@
+// -----------------------------------------------------------------------
+// <copyright file="Control.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Interactivity;
+    using Splat;
+
+    public class InputElement : Interactive, IInputElement
+    {
+        public static readonly PerspexProperty<bool> FocusableProperty =
+            PerspexProperty.Register<InputElement, bool>("Focusable");
+
+        public static readonly PerspexProperty<bool> IsFocusedProperty =
+            PerspexProperty.Register<InputElement, bool>("IsFocused", false);
+
+        public static readonly PerspexProperty<bool> IsPointerOverProperty =
+            PerspexProperty.Register<InputElement, bool>("IsPointerOver");
+
+        public static readonly RoutedEvent<RoutedEventArgs> GotFocusEvent =
+            RoutedEvent.Register<InputElement, RoutedEventArgs>("GotFocus", RoutingStrategy.Bubble);
+
+        public static readonly RoutedEvent<RoutedEventArgs> LostFocusEvent =
+            RoutedEvent.Register<InputElement, RoutedEventArgs>("LostFocus", RoutingStrategy.Bubble);
+
+        public static readonly RoutedEvent<KeyEventArgs> KeyDownEvent =
+            RoutedEvent.Register<InputElement, KeyEventArgs>("KeyDown", RoutingStrategy.Bubble);
+
+        public static readonly RoutedEvent<KeyEventArgs> PreviewKeyDownEvent =
+            RoutedEvent.Register<InputElement, KeyEventArgs>("PreviewKeyDown", RoutingStrategy.Tunnel);
+
+        public static readonly RoutedEvent<PointerEventArgs> PointerEnterEvent =
+            RoutedEvent.Register<InputElement, PointerEventArgs>("PointerEnter", RoutingStrategy.Direct);
+
+        public static readonly RoutedEvent<PointerEventArgs> PointerLeaveEvent =
+            RoutedEvent.Register<InputElement, PointerEventArgs>("PointerLeave", RoutingStrategy.Direct);
+
+        public static readonly RoutedEvent<PointerEventArgs> PointerPressedEvent =
+            RoutedEvent.Register<InputElement, PointerEventArgs>("PointerPressed", RoutingStrategy.Bubble);
+
+        public static readonly RoutedEvent<PointerEventArgs> PointerReleasedEvent =
+            RoutedEvent.Register<InputElement, PointerEventArgs>("PointerReleased", RoutingStrategy.Bubble);
+
+        public InputElement()
+        {
+            this.GotFocus += (s, e) => this.IsFocused = true;
+            this.LostFocus += (s, e) => this.IsFocused = false;
+            this.PointerEnter += (s, e) => this.IsPointerOver = true;
+            this.PointerLeave += (s, e) => this.IsPointerOver = false;
+        }
+
+        public event EventHandler<RoutedEventArgs> GotFocus
+        {
+            add { this.AddHandler(GotFocusEvent, value); }
+            remove { this.RemoveHandler(GotFocusEvent, value); }
+        }
+
+        public event EventHandler<RoutedEventArgs> LostFocus
+        {
+            add { this.AddHandler(LostFocusEvent, value); }
+            remove { this.RemoveHandler(LostFocusEvent, value); }
+        }
+
+        public event EventHandler<KeyEventArgs> KeyDown
+        {
+            add { this.AddHandler(KeyDownEvent, value); }
+            remove { this.RemoveHandler(KeyDownEvent, value); }
+        }
+
+        public event EventHandler<PointerEventArgs> PointerEnter
+        {
+            add { this.AddHandler(PointerEnterEvent, value); }
+            remove { this.RemoveHandler(PointerEnterEvent, value); }
+        }
+
+        public event EventHandler<PointerEventArgs> PointerLeave
+        {
+            add { this.AddHandler(PointerLeaveEvent, value); }
+            remove { this.RemoveHandler(PointerLeaveEvent, value); }
+        }
+
+        public event EventHandler<PointerEventArgs> PointerPressed
+        {
+            add { this.AddHandler(PointerPressedEvent, value); }
+            remove { this.RemoveHandler(PointerPressedEvent, value); }
+        }
+
+        public event EventHandler<PointerEventArgs> PointerReleased
+        {
+            add { this.AddHandler(PointerReleasedEvent, value); }
+            remove { this.RemoveHandler(PointerReleasedEvent, value); }
+        }
+
+        public bool Focusable
+        {
+            get { return this.GetValue(FocusableProperty); }
+            set { this.SetValue(FocusableProperty, value); }
+        }
+
+        public bool IsFocused
+        {
+            get { return this.GetValue(IsFocusedProperty); }
+            private set { this.SetValue(IsFocusedProperty, value); }
+        }
+
+        public bool IsPointerOver
+        {
+            get { return this.GetValue(IsPointerOverProperty); }
+            internal set { this.SetValue(IsPointerOverProperty, value); }
+        }
+
+        public void Focus()
+        {
+            Locator.Current.GetService<IFocusManager>().Focus(this);
+        }
+    }
+}

Perspex.Input/InputManager.cs

@@ -0,0 +1,64 @@
+// -----------------------------------------------------------------------
+// <copyright file="InputManager.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive.Subjects;
+    using Perspex.Input.Raw;
+
+    public class InputManager : IInputManager
+    {
+        private List<IInputElement> pointerOvers = new List<IInputElement>();
+
+        private Subject<RawInputEventArgs> rawEventReceived = new Subject<RawInputEventArgs>();
+
+        public IObservable<RawInputEventArgs> RawEventReceived
+        {
+            get { return this.rawEventReceived; }
+        }
+
+        public void Process(RawInputEventArgs e)
+        {
+            this.rawEventReceived.OnNext(e);
+        }
+
+        public void SetPointerOver(IPointerDevice device, IVisual visual, Point p)
+        {
+            IEnumerable<IInputElement> hits = visual.GetVisualsAt(p).OfType<IInputElement>();
+
+            foreach (var control in this.pointerOvers.Except(hits).ToList())
+            {
+                PointerEventArgs e = new PointerEventArgs
+                {
+                    RoutedEvent = InputElement.PointerLeaveEvent,
+                    Device = device,
+                    OriginalSource = control,
+                    Source = control,
+                };
+
+                this.pointerOvers.Remove(control);
+                control.RaiseEvent(e);
+            }
+
+            foreach (var control in hits.Except(this.pointerOvers))
+            {
+                PointerEventArgs e = new PointerEventArgs
+                {
+                    RoutedEvent = InputElement.PointerEnterEvent,
+                    Device = device,
+                    OriginalSource = control,
+                    Source = control,
+                };
+
+                this.pointerOvers.Add(control);
+                control.RaiseEvent(e);
+            }
+        }
+    }
+}

Perspex.Input/Key.cs

@@ -0,0 +1,214 @@
+// -----------------------------------------------------------------------
+// <copyright file="Key.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    public enum Key
+    {
+        None = 0,
+        Cancel = 1,
+        Back = 2,
+        Tab = 3,
+        LineFeed = 4,
+        Clear = 5,
+        Return = 6,
+        Enter = 6,
+        Pause = 7,
+        CapsLock = 8,
+        Capital = 8,
+        HangulMode = 9,
+        KanaMode = 9,
+        JunjaMode = 10,
+        FinalMode = 11,
+        KanjiMode = 12,
+        HanjaMode = 12,
+        Escape = 13,
+        ImeConvert = 14,
+        ImeNonConvert = 15,
+        ImeAccept = 16,
+        ImeModeChange = 17,
+        Space = 18,
+        PageUp = 19,
+        Prior = 19,
+        PageDown = 20,
+        Next = 20,
+        End = 21,
+        Home = 22,
+        Left = 23,
+        Up = 24,
+        Right = 25,
+        Down = 26,
+        Select = 27,
+        Print = 28,
+        Execute = 29,
+        Snapshot = 30,
+        PrintScreen = 30,
+        Insert = 31,
+        Delete = 32,
+        Help = 33,
+        D0 = 34,
+        D1 = 35,
+        D2 = 36,
+        D3 = 37,
+        D4 = 38,
+        D5 = 39,
+        D6 = 40,
+        D7 = 41,
+        D8 = 42,
+        D9 = 43,
+        A = 44,
+        B = 45,
+        C = 46,
+        D = 47,
+        E = 48,
+        F = 49,
+        G = 50,
+        H = 51,
+        I = 52,
+        J = 53,
+        K = 54,
+        L = 55,
+        M = 56,
+        N = 57,
+        O = 58,
+        P = 59,
+        Q = 60,
+        R = 61,
+        S = 62,
+        T = 63,
+        U = 64,
+        V = 65,
+        W = 66,
+        X = 67,
+        Y = 68,
+        Z = 69,
+        LWin = 70,
+        RWin = 71,
+        Apps = 72,
+        Sleep = 73,
+        NumPad0 = 74,
+        NumPad1 = 75,
+        NumPad2 = 76,
+        NumPad3 = 77,
+        NumPad4 = 78,
+        NumPad5 = 79,
+        NumPad6 = 80,
+        NumPad7 = 81,
+        NumPad8 = 82,
+        NumPad9 = 83,
+        Multiply = 84,
+        Add = 85,
+        Separator = 86,
+        Subtract = 87,
+        Decimal = 88,
+        Divide = 89,
+        F1 = 90,
+        F2 = 91,
+        F3 = 92,
+        F4 = 93,
+        F5 = 94,
+        F6 = 95,
+        F7 = 96,
+        F8 = 97,
+        F9 = 98,
+        F10 = 99,
+        F11 = 100,
+        F12 = 101,
+        F13 = 102,
+        F14 = 103,
+        F15 = 104,
+        F16 = 105,
+        F17 = 106,
+        F18 = 107,
+        F19 = 108,
+        F20 = 109,
+        F21 = 110,
+        F22 = 111,
+        F23 = 112,
+        F24 = 113,
+        NumLock = 114,
+        Scroll = 115,
+        LeftShift = 116,
+        RightShift = 117,
+        LeftCtrl = 118,
+        RightCtrl = 119,
+        LeftAlt = 120,
+        RightAlt = 121,
+        BrowserBack = 122,
+        BrowserForward = 123,
+        BrowserRefresh = 124,
+        BrowserStop = 125,
+        BrowserSearch = 126,
+        BrowserFavorites = 127,
+        BrowserHome = 128,
+        VolumeMute = 129,
+        VolumeDown = 130,
+        VolumeUp = 131,
+        MediaNextTrack = 132,
+        MediaPreviousTrack = 133,
+        MediaStop = 134,
+        MediaPlayPause = 135,
+        LaunchMail = 136,
+        SelectMedia = 137,
+        LaunchApplication1 = 138,
+        LaunchApplication2 = 139,
+        OemSemicolon = 140,
+        Oem1 = 140,
+        OemPlus = 141,
+        OemComma = 142,
+        OemMinus = 143,
+        OemPeriod = 144,
+        OemQuestion = 145,
+        Oem2 = 145,
+        OemTilde = 146,
+        Oem3 = 146,
+        AbntC1 = 147,
+        AbntC2 = 148,
+        OemOpenBrackets = 149,
+        Oem4 = 149,
+        OemPipe = 150,
+        Oem5 = 150,
+        OemCloseBrackets = 151,
+        Oem6 = 151,
+        OemQuotes = 152,
+        Oem7 = 152,
+        Oem8 = 153,
+        OemBackslash = 154,
+        Oem102 = 154,
+        ImeProcessed = 155,
+        System = 156,
+        OemAttn = 157,
+        DbeAlphanumeric = 157,
+        OemFinish = 158,
+        DbeKatakana = 158,
+        DbeHiragana = 159,
+        OemCopy = 159,
+        DbeSbcsChar = 160,
+        OemAuto = 160,
+        DbeDbcsChar = 161,
+        OemEnlw = 161,
+        OemBackTab = 162,
+        DbeRoman = 162,
+        DbeNoRoman = 163,
+        Attn = 163,
+        CrSel = 164,
+        DbeEnterWordRegisterMode = 164,
+        ExSel = 165,
+        DbeEnterImeConfigureMode = 165,
+        EraseEof = 166,
+        DbeFlushString = 166,
+        Play = 167,
+        DbeCodeInput = 167,
+        DbeNoCodeInput = 168,
+        Zoom = 168,
+        NoName = 169,
+        DbeDetermineString = 169,
+        DbeEnterDialogConversionMode = 170,
+        Pa1 = 170,
+        OemClear = 171,
+        DeadCharProcessed = 172,
+    }
+}

Perspex.Input/KeyEventArgs.cs

@@ -0,0 +1,20 @@
+// -----------------------------------------------------------------------
+// <copyright file="PointerEventArgs.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Interactivity;
+
+    public class KeyEventArgs : RoutedEventArgs
+    {
+        public IKeyboardDevice Device { get; set; }
+
+        public Key Key { get; set; }
+
+        public string Text { get; set; }
+    }
+}

Perspex.Input/KeyboardDevice.cs

@@ -0,0 +1,75 @@
+// -----------------------------------------------------------------------
+// <copyright file="KeyboardDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using Perspex.Input.Raw;
+    using Splat;
+
+    public abstract class KeyboardDevice : IKeyboardDevice
+    {
+        public KeyboardDevice()
+        {
+            this.InputManager.RawEventReceived
+                .OfType<RawKeyEventArgs>()
+                .Where(x => x.Device == this)
+                .Subscribe(this.ProcessRawEvent);
+        }
+
+        public IInputManager InputManager
+        {
+            get { return Locator.Current.GetService<IInputManager>(); }
+        }
+
+        public IFocusManager FocusManager
+        {
+            get { return Locator.Current.GetService<IFocusManager>(); }
+        }
+
+        public IInputElement FocusedElement
+        {
+            get;
+            protected set;
+        }
+
+        public abstract ModifierKeys Modifiers { get; }
+
+        private void ProcessRawEvent(RawKeyEventArgs e)
+        {
+            IInputElement element = this.FocusedElement;
+
+            if (element != null)
+            {
+                switch (e.Type)
+                {
+                    case RawKeyEventType.KeyDown:
+                        element.RaiseEvent(new KeyEventArgs
+                        {
+                            RoutedEvent = InputElement.PreviewKeyDownEvent,
+                            Device = this,
+                            Key = e.Key,
+                            Text = e.Text,
+                            Source = element,
+                            OriginalSource = element,
+                        });
+                        element.RaiseEvent(new KeyEventArgs
+                        {
+                            RoutedEvent = InputElement.KeyDownEvent,
+                            Device = this,
+                            Key = e.Key,
+                            Text = e.Text,
+                            Source = element,
+                            OriginalSource = element,
+                        });
+                        break;
+                }
+            }
+        }
+    }
+}

Perspex.Input/MouseDevice.cs

@@ -0,0 +1,163 @@
+// -----------------------------------------------------------------------
+// <copyright file="MouseDevice.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using System.Linq;
+    using System.Reactive.Linq;
+    using Perspex.Input.Raw;
+    using Perspex.Interactivity;
+    using Splat;
+
+    public abstract class MouseDevice : IMouseDevice
+    {
+        public MouseDevice()
+        {
+            this.InputManager.RawEventReceived
+                .OfType<RawMouseEventArgs>()
+                .Where(x => x.Device == this)
+                .Subscribe(this.ProcessRawEvent);
+        }
+
+        public IInteractive Captured
+        {
+            get;
+            protected set;
+        }
+
+        public IInputManager InputManager
+        {
+            get { return Locator.Current.GetService<IInputManager>(); }
+        }
+
+        public Point Position
+        {
+            get;
+            protected set;
+        }
+
+        public virtual void Capture(IInteractive control)
+        {
+            this.Captured = control;
+        }
+
+        public Point GetPosition(IVisual relativeTo)
+        {
+            Point p = this.GetClientPosition();
+            IVisual v = relativeTo;
+
+            while (v != null)
+            {
+                p -= v.Bounds.Position;
+                v = v.VisualParent;
+            }
+
+            return p;
+        }
+
+        protected abstract Point GetClientPosition();
+
+        private void ProcessRawEvent(RawMouseEventArgs e)
+        {
+            this.Position = e.Position;
+
+            switch (e.Type)
+            {
+                case RawMouseEventType.Move:
+                    this.MouseMove((IMouseDevice)e.Device, (IVisual)e.Root, e.Position);
+                    break;
+                case RawMouseEventType.LeftButtonDown:
+                    this.MouseDown((IMouseDevice)e.Device, (IVisual)e.Root, e.Position);
+                    break;
+                case RawMouseEventType.LeftButtonUp:
+                    this.MouseUp((IMouseDevice)e.Device, (IVisual)e.Root, e.Position);
+                    break;
+            }
+        }
+
+        private void MouseMove(IMouseDevice device, IVisual visual, Point p)
+        {
+            if (this.Captured == null)
+            {
+                this.InputManager.SetPointerOver(this, visual, p);
+            }
+            else
+            {
+                Point offset = new Point();
+
+                foreach (IVisual ancestor in this.Captured.GetVisualAncestors())
+                {
+                    offset += ancestor.Bounds.Position;
+                }
+
+                this.InputManager.SetPointerOver(this, this.Captured, p - offset);
+            }
+        }
+
+        private void MouseDown(IMouseDevice device, IVisual visual, Point p)
+        {
+            IVisual hit = visual.GetVisualAt(p);
+
+            if (hit != null)
+            {
+                IInteractive source = this.GetSource(hit);
+
+                if (source != null)
+                {
+                    source.RaiseEvent(new PointerEventArgs
+                    {
+                        Device = this,
+                        RoutedEvent = InputElement.PointerPressedEvent,
+                        OriginalSource = source,
+                        Source = source,
+                    });
+                }
+
+                IInputElement focusable = this.GetFocusable(hit);
+
+                if (focusable != null && focusable.Focusable)
+                {
+                    focusable.Focus();
+                }
+            }
+        }
+
+        private void MouseUp(IMouseDevice device, IVisual visual, Point p)
+        {
+            IVisual hit = visual.GetVisualAt(p);
+
+            if (hit != null)
+            {
+                IInteractive source = this.GetSource(hit);
+
+                if (source != null)
+                {
+                    source.RaiseEvent(new PointerEventArgs
+                    {
+                        Device = this,
+                        RoutedEvent = InputElement.PointerReleasedEvent,
+                        OriginalSource = source,
+                        Source = source,
+                    });
+                }
+            }
+        }
+
+        private IInputElement GetFocusable(IVisual hit)
+        {
+            return this.Captured as IInputElement ?? 
+                hit.GetSelfAndVisualAncestors().OfType<IInputElement>().FirstOrDefault(x => x.Focusable);
+        }
+
+        private IInteractive GetSource(IVisual hit)
+        {
+            return this.Captured ?? 
+                (hit as IInteractive) ?? 
+                hit.GetSelfAndVisualAncestors().OfType<IInteractive>().FirstOrDefault();
+        }
+    }
+}

Perspex.Input/Perspex.Input.csproj

@@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{62024B2D-53EB-4638-B26B-85EEAA54866E}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Perspex.Input</RootNamespace>
+    <AssemblyName>Perspex.Input</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile7</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <!-- A reference to the entire .NET Framework is automatically included -->
+    <ProjectReference Include="..\Perspex.Base\Perspex.Base.csproj">
+      <Project>{b09b78d8-9b26-48b0-9149-d64a2f120f3f}</Project>
+      <Name>Perspex.Base</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Interactivity\Perspex.Interactivity.csproj">
+      <Project>{6b0ed19d-a08b-461c-a9d9-a9ee40b0c06b}</Project>
+      <Name>Perspex.Interactivity</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Layout\Perspex.Layout.csproj">
+      <Project>{42472427-4774-4c81-8aff-9f27b8e31721}</Project>
+      <Name>Perspex.Layout</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.SceneGraph\Perspex.SceneGraph.csproj">
+      <Project>{eb582467-6abb-43a1-b052-e981ba910e3a}</Project>
+      <Name>Perspex.SceneGraph</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="FocusManager.cs" />
+    <Compile Include="IFocusManager.cs" />
+    <Compile Include="IInputDevice.cs" />
+    <Compile Include="IInputElement.cs" />
+    <Compile Include="IInputManager.cs" />
+    <Compile Include="IKeyboardDevice.cs" />
+    <Compile Include="IMouseDevice.cs" />
+    <Compile Include="InputElement.cs" />
+    <Compile Include="InputManager.cs" />
+    <Compile Include="IPointerDevice.cs" />
+    <Compile Include="Key.cs" />
+    <Compile Include="KeyboardDevice.cs" />
+    <Compile Include="KeyEventArgs.cs" />
+    <Compile Include="MouseDevice.cs" />
+    <Compile Include="PointerEventArgs.cs" />
+    <Compile Include="Raw\RawInputEventArgs.cs" />
+    <Compile Include="Raw\RawKeyEventArgs.cs" />
+    <Compile Include="Raw\RawMouseEventArgs.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="Splat">
+      <HintPath>..\packages\Splat.1.3.3\lib\Portable-net45+win+wpa81+wp80\Splat.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Core">
+      <HintPath>..\packages\Rx-Core.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>..\packages\Rx-Interfaces.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Linq">
+      <HintPath>..\packages\Rx-Linq.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Linq.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <Import Project="..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets" Condition="Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets'))" />
+  </Target>
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Perspex.Input/PointerEventArgs.cs

@@ -0,0 +1,21 @@
+// -----------------------------------------------------------------------
+// <copyright file="PointerEventArgs.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using Perspex.Interactivity;
+
+    public class PointerEventArgs : RoutedEventArgs
+    {
+        public IPointerDevice Device { get; set; }
+
+        public Point GetPosition(IVisual relativeTo)
+        {
+            return this.Device.GetPosition(relativeTo);
+        }
+    }
+}

Perspex.Input/Properties/AssemblyInfo.cs

@@ -0,0 +1,30 @@
+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Perspex.Input")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Perspex.Input")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Perspex.Input/Raw/RawInputEventArgs.cs

@@ -0,0 +1,27 @@
+// -----------------------------------------------------------------------
+// <copyright file="RawInputEventArgs.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input.Raw
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Text;
+    using System.Threading.Tasks;
+    using Perspex.Layout;
+
+    public class RawInputEventArgs : EventArgs
+    {
+        public RawInputEventArgs(IInputDevice device)
+        {
+            Contract.Requires<ArgumentNullException>(device != null);
+
+            this.Device = device;
+        }
+
+        public IInputDevice Device { get; private set; }
+    }
+}

Perspex.Input/Raw/RawKeyEventArgs.cs

@@ -0,0 +1,31 @@
+// -----------------------------------------------------------------------
+// <copyright file="RawKeyEventArgs.cs" company="Tricycle">
+// Copyright 2014 Tricycle. All rights reserved.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input.Raw
+{
+    public enum RawKeyEventType
+    {
+        KeyDown,
+        KeyUp
+    }
+
+    public class RawKeyEventArgs : RawInputEventArgs
+    {
+        public RawKeyEventArgs(KeyboardDevice device, RawKeyEventType type, Key key, string text)
+            : base(device)
+        {
+            this.Key = key;
+            this.Type = type;
+            this.Text = text;
+        }
+
+        public Key Key { get; set; }
+
+        public string Text { get; set; }
+
+        public RawKeyEventType Type { get; set; }
+    }
+}

Perspex.Input/Raw/RawMouseEventArgs.cs

@@ -0,0 +1,42 @@
+// -----------------------------------------------------------------------
+// <copyright file="RawMouseEventArgs.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input.Raw
+{
+    using System;
+    using Perspex.Layout;
+
+    public enum RawMouseEventType
+    {
+        Move,
+        LeftButtonDown,
+        LeftButtonUp,
+    }
+
+    public class RawMouseEventArgs : RawInputEventArgs
+    {
+        public RawMouseEventArgs(
+            IInputDevice device,
+            ILayoutRoot root,
+            RawMouseEventType type,
+            Point position)
+            : base(device)
+        {
+            Contract.Requires<ArgumentNullException>(device != null);
+            Contract.Requires<ArgumentNullException>(root != null);
+
+            this.Root = root;
+            this.Position = position;
+            this.Type = type;
+        }
+
+        public ILayoutRoot Root { get; private set; }
+
+        public Point Position { get; private set; }
+
+        public RawMouseEventType Type { get; private set; }
+    }
+}

Perspex.Input/packages.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Rx-Core" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Interfaces" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Linq" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Main" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-PlatformServices" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Splat" version="1.3.3" targetFramework="portable-net45+win" />
+  <package id="StyleCop.MSBuild" version="4.7.49.0" targetFramework="portable-net45+win" developmentDependency="true" />
+</packages>

Perspex.Interactivity/IInteractive.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IInteractive.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Interactivity
+{
+    public interface IInteractive : IVisual
+    {
+        void RaiseEvent(RoutedEventArgs e);
+    }
+}

Perspex.Interactivity/Interactive.cs

@@ -0,0 +1,124 @@
+// -----------------------------------------------------------------------
+// <copyright file="Interactive.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Interactivity
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reactive;
+    using System.Reactive.Linq;
+    using Perspex.Layout;
+
+    public class Interactive : Layoutable, IInteractive
+    {
+        private Dictionary<RoutedEvent, List<Delegate>> eventHandlers = new Dictionary<RoutedEvent, List<Delegate>>();
+
+        public void AddHandler(RoutedEvent routedEvent, Delegate handler)
+        {
+            Contract.Requires<NullReferenceException>(routedEvent != null);
+            Contract.Requires<NullReferenceException>(handler != null);
+
+            List<Delegate> delegates;
+
+            if (!this.eventHandlers.TryGetValue(routedEvent, out delegates))
+            {
+                delegates = new List<Delegate>();
+                this.eventHandlers.Add(routedEvent, delegates);
+            }
+
+            delegates.Add(handler);
+        }
+
+        public IObservable<EventPattern<T>> GetObservable<T>(RoutedEvent<T> routedEvent) where T : RoutedEventArgs
+        {
+            Contract.Requires<NullReferenceException>(routedEvent != null);
+
+            return Observable.FromEventPattern<T>(
+                handler => this.AddHandler(routedEvent, handler),
+                handler => this.RemoveHandler(routedEvent, handler));
+        }
+
+        public void RemoveHandler(RoutedEvent routedEvent, Delegate handler)
+        {
+            Contract.Requires<NullReferenceException>(routedEvent != null);
+            Contract.Requires<NullReferenceException>(handler != null);
+
+            List<Delegate> delegates;
+
+            if (this.eventHandlers.TryGetValue(routedEvent, out delegates))
+            {
+                delegates.Remove(handler);
+            }
+        }
+
+        public void RaiseEvent(RoutedEventArgs e)
+        {
+            Contract.Requires<NullReferenceException>(e != null);
+
+            if (e.RoutedEvent != null)
+            {
+                switch (e.RoutedEvent.RoutingStrategy)
+                {
+                    case RoutingStrategy.Bubble:
+                        this.BubbleEvent(e);
+                        break;
+                    case RoutingStrategy.Direct:
+                        this.RaiseEventImpl(e);
+                        break;
+                    case RoutingStrategy.Tunnel:
+                        this.TunnelEvent(e);
+                        break;
+                }
+            }
+        }
+
+        private void BubbleEvent(RoutedEventArgs e)
+        {
+            Contract.Requires<NullReferenceException>(e != null);
+
+            foreach (var target in this.GetSelfAndVisualAncestors().OfType<Interactive>())
+            {
+                target.RaiseEventImpl(e);
+
+                if (e.Handled)
+                {
+                    break;
+                }
+            }
+        }
+
+        private void TunnelEvent(RoutedEventArgs e)
+        {
+            Contract.Requires<NullReferenceException>(e != null);
+
+            foreach (var target in this.GetSelfAndVisualAncestors().OfType<Interactive>().Reverse())
+            {
+                target.RaiseEventImpl(e);
+
+                if (e.Handled)
+                {
+                    break;
+                }
+            }
+        }
+
+        private void RaiseEventImpl(RoutedEventArgs e)
+        {
+            Contract.Requires<NullReferenceException>(e != null);
+
+            List<Delegate> delegates;
+
+            if (this.eventHandlers.TryGetValue(e.RoutedEvent, out delegates))
+            {
+                foreach (Delegate handler in delegates)
+                {
+                    handler.DynamicInvoke(this, e);
+                }
+            }
+        }
+    }
+}

Perspex.Interactivity/Perspex.Interactivity.csproj

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{6B0ED19D-A08B-461C-A9D9-A9EE40B0C06B}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Perspex</RootNamespace>
+    <AssemblyName>Perspex.Interactive</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TargetFrameworkProfile>Profile7</TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <!-- A reference to the entire .NET Framework is automatically included -->
+    <ProjectReference Include="..\Perspex.Base\Perspex.Base.csproj">
+      <Project>{b09b78d8-9b26-48b0-9149-d64a2f120f3f}</Project>
+      <Name>Perspex.Base</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.Layout\Perspex.Layout.csproj">
+      <Project>{42472427-4774-4c81-8aff-9f27b8e31721}</Project>
+      <Name>Perspex.Layout</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\Perspex.SceneGraph\Perspex.SceneGraph.csproj">
+      <Project>{eb582467-6abb-43a1-b052-e981ba910e3a}</Project>
+      <Name>Perspex.SceneGraph</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="IInteractive.cs" />
+    <Compile Include="Interactive.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="RoutedEvent.cs" />
+    <Compile Include="RoutedEventArgs.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="Splat">
+      <HintPath>..\packages\Splat.1.3.3\lib\Portable-net45+win+wpa81+wp80\Splat.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Core">
+      <HintPath>..\packages\Rx-Core.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>..\packages\Rx-Interfaces.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Linq">
+      <HintPath>..\packages\Rx-Linq.2.1.30214.0\lib\Portable-Net45+WinRT45+WP8\System.Reactive.Linq.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
+  <Import Project="..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets" Condition="Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\StyleCop.MSBuild.4.7.49.0\build\StyleCop.MSBuild.Targets'))" />
+  </Target>
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Perspex.Interactivity/Properties/AssemblyInfo.cs

@@ -0,0 +1,30 @@
+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Perspex.Interactive")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Perspex.Interactive")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Perspex.Interactivity/RoutedEvent.cs

@@ -0,0 +1,97 @@
+// -----------------------------------------------------------------------
+// <copyright file="RoutedEvent.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Interactivity
+{
+    using System;
+    using System.Reflection;
+
+    public enum RoutingStrategy
+    {
+        Tunnel,
+        Bubble,
+        Direct,
+    }
+
+    public class RoutedEvent
+    {
+        public RoutedEvent(
+            string name, 
+            RoutingStrategy routingStrategy,
+            Type eventArgsType,
+            Type ownerType)
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+            Contract.Requires<NullReferenceException>(eventArgsType != null);
+            Contract.Requires<NullReferenceException>(ownerType != null);
+            Contract.Requires<InvalidCastException>(typeof(RoutedEventArgs).GetTypeInfo().IsAssignableFrom(eventArgsType.GetTypeInfo()));
+            Contract.Requires<InvalidCastException>(typeof(Interactive).GetTypeInfo().IsAssignableFrom(ownerType.GetTypeInfo()));
+
+            this.EventArgsType = eventArgsType;
+            this.Name = name;
+            this.OwnerType = ownerType;
+            this.RoutingStrategy = routingStrategy;
+        }
+
+        public Type EventArgsType 
+        { 
+            get; 
+            private set; 
+        }
+
+        public string Name 
+        { 
+            get; 
+            private set; 
+        }
+
+        public Type OwnerType 
+        { 
+            get; 
+            private set; 
+        }
+
+        public RoutingStrategy RoutingStrategy 
+        { 
+            get; 
+            private set; 
+        }
+
+        public static RoutedEvent<TEventArgs> Register<TOwner, TEventArgs>(
+            string name,
+            RoutingStrategy routingStrategy)
+                where TOwner : Interactive
+                where TEventArgs : RoutedEventArgs
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+
+            return new RoutedEvent<TEventArgs>(name, routingStrategy, typeof(TOwner));
+        }
+
+        public static RoutedEvent<TEventArgs> Register<TEventArgs>(
+            string name,
+            RoutingStrategy routingStrategy,
+            Type ownerType) 
+                where TEventArgs : RoutedEventArgs
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+
+            return new RoutedEvent<TEventArgs>(name, routingStrategy, ownerType);
+        }
+    }
+
+    public class RoutedEvent<TEventArgs> : RoutedEvent
+        where TEventArgs : RoutedEventArgs
+    {
+        public RoutedEvent(string name, RoutingStrategy routingStrategy, Type ownerType)
+            : base(name, routingStrategy, typeof(TEventArgs), ownerType)
+        {
+            Contract.Requires<NullReferenceException>(name != null);
+            Contract.Requires<NullReferenceException>(ownerType != null);
+            Contract.Requires<InvalidCastException>(typeof(Interactive).GetTypeInfo().IsAssignableFrom(ownerType.GetTypeInfo()));
+        }
+    }
+}

Perspex.Interactivity/RoutedEventArgs.cs

@@ -0,0 +1,36 @@
+// -----------------------------------------------------------------------
+// <copyright file="RoutedEventArgs.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Interactivity
+{
+    using System;
+
+    public class RoutedEventArgs : EventArgs
+    {
+        public RoutedEventArgs()
+        {
+        }
+
+        public RoutedEventArgs(RoutedEvent routedEvent)
+        {
+            this.RoutedEvent = routedEvent;
+        }
+
+        public RoutedEventArgs(RoutedEvent routedEvent, IInteractive source)
+        {
+            this.RoutedEvent = routedEvent;
+            this.Source = source;
+        }
+
+        public bool Handled { get; set; }
+
+        public IInteractive OriginalSource { get; set; }
+
+        public RoutedEvent RoutedEvent { get; set; }
+
+        public IInteractive Source { get; set; }
+    }
+}

Perspex.Interactivity/packages.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Rx-Core" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Interfaces" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Linq" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-Main" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Rx-PlatformServices" version="2.1.30214.0" targetFramework="portable-net45+win" />
+  <package id="Splat" version="1.3.3" targetFramework="portable-net45+win" />
+  <package id="StyleCop.MSBuild" version="4.7.49.0" targetFramework="portable-net45+win" developmentDependency="true" />
+</packages>