diff --git a/src/Markup/Perspex.Markup/Data/LogicalNotNode.cs b/src/Markup/Perspex.Markup/Data/LogicalNotNode.cs
index 2447aee4f2..a2941684b4 100644
--- a/src/Markup/Perspex.Markup/Data/LogicalNotNode.cs
+++ b/src/Markup/Perspex.Markup/Data/LogicalNotNode.cs
@@ -11,7 +11,7 @@ namespace Perspex.Markup.Data
     {
         public override bool SetValue(object value)
         {
-            throw new NotSupportedException("Cannot set a negated binding.");
+            return false;
         }
 
         public override IDisposable Subscribe(IObserver<object> observer)
diff --git a/src/Markup/Perspex.Markup/DefaultValueConverter.cs b/src/Markup/Perspex.Markup/DefaultValueConverter.cs
index e49c1c3ae6..23bb0f774c 100644
--- a/src/Markup/Perspex.Markup/DefaultValueConverter.cs
+++ b/src/Markup/Perspex.Markup/DefaultValueConverter.cs
@@ -3,6 +3,8 @@
 
 using System;
 using System.Globalization;
+using System.Linq;
+using System.Reflection;
 using Perspex.Utilities;
 
 namespace Perspex.Markup
@@ -30,7 +32,9 @@ namespace Perspex.Markup
         {
             object result;
 
-            if (value != null && TypeUtilities.TryConvert(targetType, value, culture, out result))
+            if (value != null && 
+                (TypeUtilities.TryConvert(targetType, value, culture, out result) ||
+                 TryConvertEnum(value, targetType, culture, out result)))
             {
                 return result;
             }
@@ -52,5 +56,34 @@ namespace Perspex.Markup
         {
             return Convert(value, targetType, parameter, culture);
         }
+
+        private bool TryConvertEnum(object value, Type targetType, CultureInfo cultur, out object result)
+        {
+            var valueTypeInfo = value.GetType().GetTypeInfo();
+            var targetTypeInfo = targetType.GetTypeInfo();
+
+            if (valueTypeInfo.IsEnum && !targetTypeInfo.IsEnum)
+            {
+                var enumValue = (int)value;
+
+                if (TypeUtilities.TryCast(targetType, enumValue, out result))
+                {
+                    return true;
+                }
+            }
+            else if (!valueTypeInfo.IsEnum && targetTypeInfo.IsEnum)
+            {
+                object intValue;
+
+                if (TypeUtilities.TryCast(typeof(int), value, out intValue))
+                {
+                    result = Enum.ToObject(targetType, intValue);
+                    return true;
+                }
+            }
+
+            result = null;
+            return false;
+        }
     }
 }
diff --git a/src/Perspex.Base/DirectProperty.cs b/src/Perspex.Base/DirectProperty.cs
index c926f28240..7ae19ec520 100644
--- a/src/Perspex.Base/DirectProperty.cs
+++ b/src/Perspex.Base/DirectProperty.cs
@@ -24,11 +24,13 @@ namespace Perspex
         /// <param name="name">The name of the property.</param>
         /// <param name="getter">Gets the current value of the property.</param>
         /// <param name="setter">Sets the value of the property. May be null.</param>
+        /// <param name="metadata">The property metadata.</param>
         public DirectProperty(
             string name,
             Func<TOwner, TValue> getter,
-            Action<TOwner, TValue> setter = null)
-            : base(name, typeof(TOwner), new PropertyMetadata())
+            Action<TOwner, TValue> setter,
+            PropertyMetadata metadata)
+            : base(name, typeof(TOwner), metadata)
         {
             Contract.Requires<ArgumentNullException>(getter != null);
 
diff --git a/src/Perspex.Base/PerspexProperty.cs b/src/Perspex.Base/PerspexProperty.cs
index 4c0b6fd724..8998627849 100644
--- a/src/Perspex.Base/PerspexProperty.cs
+++ b/src/Perspex.Base/PerspexProperty.cs
@@ -342,16 +342,19 @@ namespace Perspex
         /// <param name="name">The name of the property.</param>
         /// <param name="getter">Gets the current value of the property.</param>
         /// <param name="setter">Sets the value of the property.</param>
+        /// <param name="defaultBindingMode">The default binding mode for the property.</param>
         /// <returns>A <see cref="PerspexProperty{TValue}"/></returns>
         public static DirectProperty<TOwner, TValue> RegisterDirect<TOwner, TValue>(
             string name,
             Func<TOwner, TValue> getter,
-            Action<TOwner, TValue> setter = null)
+            Action<TOwner, TValue> setter = null,
+            BindingMode defaultBindingMode = BindingMode.OneWay)
                 where TOwner : IPerspexObject
         {
             Contract.Requires<ArgumentNullException>(name != null);
 
-            var result = new DirectProperty<TOwner, TValue>(name, getter, setter);
+            var metadata = new PropertyMetadata(defaultBindingMode);
+            var result = new DirectProperty<TOwner, TValue>(name, getter, setter, metadata);
             PerspexPropertyRegistry.Instance.Register(typeof(TOwner), result);
             return result;
         }
diff --git a/src/Perspex.Base/Utilities/TypeUtilities.cs b/src/Perspex.Base/Utilities/TypeUtilities.cs
index 3d19de5f97..c6d16d56b2 100644
--- a/src/Perspex.Base/Utilities/TypeUtilities.cs
+++ b/src/Perspex.Base/Utilities/TypeUtilities.cs
@@ -119,6 +119,12 @@ namespace Perspex.Utilities
                 return true;
             }
 
+            if (to == typeof(string))
+            {
+                result = Convert.ToString(value);
+                return true;
+            }
+
             if (to.GetTypeInfo().IsEnum && from == typeof(string))
             {
                 if (Enum.IsDefined(to, (string)value))
@@ -131,9 +137,7 @@ namespace Perspex.Utilities
             bool containsFrom = Conversions.ContainsKey(from);
             bool containsTo = Conversions.ContainsKey(to);
 
-            if ((containsFrom && containsTo) ||
-                (from == typeof(string) && containsTo) ||
-                (to == typeof(string) && containsFrom))
+            if ((containsFrom && containsTo) || (from == typeof(string) && containsTo))
             {
                 try
                 {
diff --git a/src/Perspex.Controls/Generators/IItemContainerGenerator.cs b/src/Perspex.Controls/Generators/IItemContainerGenerator.cs
index 85628e3374..490ee8899b 100644
--- a/src/Perspex.Controls/Generators/IItemContainerGenerator.cs
+++ b/src/Perspex.Controls/Generators/IItemContainerGenerator.cs
@@ -52,6 +52,13 @@ namespace Perspex.Controls.Generators
         /// <returns>The removed containers.</returns>
         IEnumerable<ItemContainer> Dematerialize(int startingIndex, int count);
 
+        /// <summary>
+        /// Inserts space for newly inserted containers in the index.
+        /// </summary>
+        /// <param name="index">The index at which space should be inserted.</param>
+        /// <param name="count">The number of blank spaces to create.</param>
+        void InsertSpace(int index, int count);
+
         /// <summary>
         /// Removes a set of created containers and updates the index of later containers to fill
         /// the gap.
diff --git a/src/Perspex.Controls/Generators/ItemContainerGenerator.cs b/src/Perspex.Controls/Generators/ItemContainerGenerator.cs
index 2733de5770..f1f49affbf 100644
--- a/src/Perspex.Controls/Generators/ItemContainerGenerator.cs
+++ b/src/Perspex.Controls/Generators/ItemContainerGenerator.cs
@@ -85,6 +85,12 @@ namespace Perspex.Controls.Generators
             return result;
         }
 
+        /// <inheritdoc/>
+        public virtual void InsertSpace(int index, int count)
+        {
+            _containers.InsertRange(index, Enumerable.Repeat<ItemContainer>(null, count));
+        }
+
         /// <inheritdoc/>
         public virtual IEnumerable<ItemContainer> RemoveRange(int startingIndex, int count)
         {
diff --git a/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs b/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
index 9feaab3d25..11a56aa556 100644
--- a/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
+++ b/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
@@ -68,6 +68,7 @@ namespace Perspex.Controls.Generators
             }
             else if (container != null)
             {
+                Index.Add(item, container);
                 return container;
             }
             else
diff --git a/src/Perspex.Controls/Presenters/ItemsPresenter.cs b/src/Perspex.Controls/Presenters/ItemsPresenter.cs
index 29e796fd75..909a1e011f 100644
--- a/src/Perspex.Controls/Presenters/ItemsPresenter.cs
+++ b/src/Perspex.Controls/Presenters/ItemsPresenter.cs
@@ -7,6 +7,7 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using Perspex.Controls.Generators;
 using Perspex.Controls.Templates;
+using Perspex.Controls.Utils;
 using Perspex.Input;
 using Perspex.Styling;
 
@@ -237,6 +238,11 @@ namespace Perspex.Controls.Presenters
                 switch (e.Action)
                 {
                     case NotifyCollectionChangedAction.Add:
+                        if (e.NewStartingIndex + e.NewItems.Count < this.Items.Count())
+                        {
+                            generator.InsertSpace(e.NewStartingIndex, e.NewItems.Count);
+                        }
+
                         AddContainers(generator.Materialize(e.NewStartingIndex, e.NewItems, MemberSelector));
                         break;
 
@@ -281,7 +287,17 @@ namespace Perspex.Controls.Presenters
             {
                 if (i.ContainerControl != null)
                 {
-                    this.Panel.Children.Add(i.ContainerControl);
+                    if (i.Index < this.Panel.Children.Count)
+                    {
+                        // HACK: This will insert at the wrong place when there are null items,
+                        // but all of this will need to be rewritten when we implement 
+                        // virtualization so hope no-one notices until then :)
+                        this.Panel.Children.Insert(i.Index, i.ContainerControl);
+                    }
+                    else
+                    {
+                        this.Panel.Children.Add(i.ContainerControl);
+                    }
                 }
             }
         }
diff --git a/src/Perspex.Controls/Primitives/SelectingItemsControl.cs b/src/Perspex.Controls/Primitives/SelectingItemsControl.cs
index 9ec708dd6b..f6e405a24a 100644
--- a/src/Perspex.Controls/Primitives/SelectingItemsControl.cs
+++ b/src/Perspex.Controls/Primitives/SelectingItemsControl.cs
@@ -62,7 +62,7 @@ namespace Perspex.Controls.Primitives
             PerspexProperty.RegisterDirect<SelectingItemsControl, object>(
                 nameof(SelectedItem),
                 o => o.SelectedItem,
-                (o, v) => o.SelectedItem = v);
+                (o, v) => o.SelectedItem = v, BindingMode.TwoWay);
 
         /// <summary>
         /// Defines the <see cref="SelectedItems"/> property.
diff --git a/src/Perspex.Controls/Primitives/TemplatedControl.cs b/src/Perspex.Controls/Primitives/TemplatedControl.cs
index 7bf2edfbe7..10e312bb2b 100644
--- a/src/Perspex.Controls/Primitives/TemplatedControl.cs
+++ b/src/Perspex.Controls/Primitives/TemplatedControl.cs
@@ -251,7 +251,15 @@ namespace Perspex.Controls.Primitives
         {
             if (!_templateApplied)
             {
-                VisualChildren.Clear();
+                if (VisualChildren.Count > 0)
+                {
+                    foreach (var child in this.GetTemplateChildren())
+                    {
+                        child.SetValue(TemplatedParentProperty, null);
+                    }
+
+                    VisualChildren.Clear();
+                }
 
                 if (Template != null)
                 {
@@ -318,6 +326,11 @@ namespace Perspex.Controls.Primitives
         /// <param name="e">The event args.</param>
         protected virtual void OnTemplateChanged(PerspexPropertyChangedEventArgs e)
         {
+            if (_templateApplied && VisualChildren.Count > 0)
+            {
+                _templateApplied = false;
+            }
+
             _templateApplied = false;
             InvalidateMeasure();
         }
diff --git a/src/Perspex.Controls/Primitives/ToggleButton.cs b/src/Perspex.Controls/Primitives/ToggleButton.cs
index 8d464464ec..c0aedf00ba 100644
--- a/src/Perspex.Controls/Primitives/ToggleButton.cs
+++ b/src/Perspex.Controls/Primitives/ToggleButton.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Perspex.Interactivity;
+using Perspex.Data;
 
 namespace Perspex.Controls.Primitives
 {
@@ -12,7 +13,7 @@ namespace Perspex.Controls.Primitives
             PerspexProperty.RegisterDirect<ToggleButton, bool>(
                 "IsChecked",
                 o => o.IsChecked,
-                (o,v) => o.IsChecked = v);
+                (o,v) => o.IsChecked = v, BindingMode.TwoWay);
 
         private bool _isChecked;
 
diff --git a/src/Perspex.Controls/TreeViewItem.cs b/src/Perspex.Controls/TreeViewItem.cs
index fe74ebfd93..d5369840ad 100644
--- a/src/Perspex.Controls/TreeViewItem.cs
+++ b/src/Perspex.Controls/TreeViewItem.cs
@@ -20,7 +20,7 @@ namespace Perspex.Controls
         /// Defines the <see cref="IsExpanded"/> property.
         /// </summary>
         public static readonly StyledProperty<bool> IsExpandedProperty =
-            PerspexProperty.Register<TreeViewItem, bool>("IsExpanded");
+            PerspexProperty.Register<TreeViewItem, bool>("IsExpanded", default(bool), false, Data.BindingMode.TwoWay);
 
         /// <summary>
         /// Defines the <see cref="IsSelected"/> property.
@@ -30,7 +30,7 @@ namespace Perspex.Controls
 
         private static readonly ITemplate<IPanel> DefaultPanel =
             new FuncTemplate<IPanel>(() => new StackPanel
-            {
+            {                
                 [KeyboardNavigation.DirectionalNavigationProperty] = KeyboardNavigationMode.Continue,
             });
 
@@ -40,7 +40,7 @@ namespace Perspex.Controls
         /// Initializes static members of the <see cref="TreeViewItem"/> class.
         /// </summary>
         static TreeViewItem()
-        {
+        {            
             SelectableMixin.Attach<TreeViewItem>(IsSelectedProperty);
             FocusableProperty.OverrideDefaultValue<TreeViewItem>(true);
             ItemsPanelProperty.OverrideDefaultValue<TreeViewItem>(DefaultPanel);
diff --git a/tests/Perspex.Base.UnitTests/DirectPropertyTests.cs b/tests/Perspex.Base.UnitTests/DirectPropertyTests.cs
index 68e1c62cf3..9e23e59f80 100644
--- a/tests/Perspex.Base.UnitTests/DirectPropertyTests.cs
+++ b/tests/Perspex.Base.UnitTests/DirectPropertyTests.cs
@@ -30,7 +30,11 @@ namespace Perspex.Base.UnitTests
         [Fact]
         public void IsDirect_Property_Returns_True()
         {
-            var target = new DirectProperty<Class1, string>("test", o => null);
+            var target = new DirectProperty<Class1, string>(
+                "test", 
+                o => null, 
+                null, 
+                new PropertyMetadata());
 
             Assert.True(target.IsDirect);
         }
diff --git a/tests/Perspex.Controls.UnitTests/Presenters/ItemsPresenterTests.cs b/tests/Perspex.Controls.UnitTests/Presenters/ItemsPresenterTests.cs
index dd7b41caee..10737ad4d1 100644
--- a/tests/Perspex.Controls.UnitTests/Presenters/ItemsPresenterTests.cs
+++ b/tests/Perspex.Controls.UnitTests/Presenters/ItemsPresenterTests.cs
@@ -147,6 +147,26 @@ namespace Perspex.Controls.UnitTests.Presenters
             Assert.Equal(new[] { "foo", "baz", "bar" }, text);
         }
 
+        [Fact]
+        public void Inserting_Items_Should_Update_Containers()
+        {
+            var items = new ObservableCollection<string> { "foo", "bar", "baz" };
+            var target = new ItemsPresenter
+            {
+                Items = items,
+            };
+
+            target.ApplyTemplate();
+            items.Insert(2, "insert");
+
+            var text = target.Panel.Children
+                .OfType<TextBlock>()
+                .Select(x => x.Text)
+                .ToList();
+
+            Assert.Equal(new[] { "foo", "bar", "insert", "baz" }, text);
+        }
+
         [Fact]
         public void Setting_Items_To_Null_Should_Remove_Containers()
         {
diff --git a/tests/Perspex.Controls.UnitTests/Primitives/TemplatedControlTests.cs b/tests/Perspex.Controls.UnitTests/Primitives/TemplatedControlTests.cs
index 4de5d8fd3b..a93c6b3026 100644
--- a/tests/Perspex.Controls.UnitTests/Primitives/TemplatedControlTests.cs
+++ b/tests/Perspex.Controls.UnitTests/Primitives/TemplatedControlTests.cs
@@ -311,6 +311,39 @@ namespace Perspex.Controls.UnitTests.Primitives
             Assert.True(raised);
         }
 
+        [Fact]
+        public void Applying_New_Template_Clears_TemplatedParent_Of_Old_Template_Children()
+        {
+            var target = new TestTemplatedControl
+            {
+                Template = new FuncControlTemplate(_ => new Decorator
+                {
+                    Child = new Border(),
+                })
+            };
+
+            target.ApplyTemplate();
+
+            var decorator = (Decorator)target.GetVisualChildren().Single();
+            var border = (Border)decorator.Child;
+
+            Assert.Equal(target, decorator.TemplatedParent);
+            Assert.Equal(target, border.TemplatedParent);
+
+            target.Template = new FuncControlTemplate(_ => new Canvas());
+
+            // Templated children should not be removed here: the control may be re-added
+            // somewhere with the same template, so they could still be of use.
+            Assert.Same(decorator, target.GetVisualChildren().Single());
+            Assert.Equal(target, decorator.TemplatedParent);
+            Assert.Equal(target, border.TemplatedParent);
+
+            target.ApplyTemplate();
+
+            Assert.Null(decorator.TemplatedParent);
+            Assert.Null(border.TemplatedParent);
+        }
+
         private static IControl ScrollingContentControlTemplate(ContentControl control)
         {
             return new Border
diff --git a/tests/Perspex.Markup.UnitTests/Data/ExpressionObserverTests_Negation.cs b/tests/Perspex.Markup.UnitTests/Data/ExpressionObserverTests_Negation.cs
index 3581a71563..9dc40ece00 100644
--- a/tests/Perspex.Markup.UnitTests/Data/ExpressionObserverTests_Negation.cs
+++ b/tests/Perspex.Markup.UnitTests/Data/ExpressionObserverTests_Negation.cs
@@ -81,12 +81,12 @@ namespace Perspex.Markup.UnitTests.Data
         }
 
         [Fact]
-        public void SetValue_Should_Throw()
+        public void SetValue_Should_Return_False()
         {
             var data = new { Foo = "foo" };
             var target = new ExpressionObserver(data, "!Foo");
 
-            Assert.Throws<NotSupportedException>(() => target.SetValue("bar"));
+            Assert.False(target.SetValue("bar"));
         }
     }
 }
diff --git a/tests/Perspex.Markup.UnitTests/DefaultValueConverterTests.cs b/tests/Perspex.Markup.UnitTests/DefaultValueConverterTests.cs
index b438d6af1d..55034a3c53 100644
--- a/tests/Perspex.Markup.UnitTests/DefaultValueConverterTests.cs
+++ b/tests/Perspex.Markup.UnitTests/DefaultValueConverterTests.cs
@@ -2,6 +2,7 @@
 // Licensed under the MIT license. See licence.md file in the project root for full license information.
 
 using System.Globalization;
+using Perspex.Controls;
 using Xunit;
 
 namespace Perspex.Markup.UnitTests
@@ -44,6 +45,18 @@ namespace Perspex.Markup.UnitTests
             Assert.Equal(TestEnum.Bar, result);
         }
 
+        [Fact]
+        public void Can_Convert_Int_To_Enum()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                1,
+                typeof(TestEnum),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal(TestEnum.Bar, result);
+        }
+
         [Fact]
         public void Can_Convert_Double_To_String()
         {
@@ -57,15 +70,27 @@ namespace Perspex.Markup.UnitTests
         }
 
         [Fact]
-        public void Can_Convert_Double_To_Int()
+        public void Can_Convert_Enum_To_Int()
         {
             var result = DefaultValueConverter.Instance.Convert(
-                5.0,
+                TestEnum.Bar,
                 typeof(int),
                 null,
                 CultureInfo.InvariantCulture);
 
-            Assert.Equal(5, result);
+            Assert.Equal(1, result);
+        }
+
+        [Fact]
+        public void Can_Convert_Enum_To_String()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                TestEnum.Bar,
+                typeof(string),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal("Bar", result);
         }
 
         [Fact]
@@ -80,6 +105,18 @@ namespace Perspex.Markup.UnitTests
             Assert.Equal(5.0, result);
         }
 
+        [Fact]
+        public void Cannot_Convert_Between_Different_Enum_Types()
+        {
+            var result = DefaultValueConverter.Instance.Convert(
+                TestEnum.Foo,
+                typeof(Orientation),
+                null,
+                CultureInfo.InvariantCulture);
+
+            Assert.Equal(PerspexProperty.UnsetValue, result);
+        }
+
         private enum TestEnum
         {
             Foo,