diff --git a/Perspex.UnitTests/TestRoot.cs b/Perspex.UnitTests/TestRoot.cs
index af35faaf71..60df5ed428 100644
--- a/Perspex.UnitTests/TestRoot.cs
+++ b/Perspex.UnitTests/TestRoot.cs
@@ -9,6 +9,7 @@ namespace Perspex.UnitTests
     using System;
     using System.Collections.Generic;
     using System.Reactive.Disposables;
+    using Moq;
     using Perspex.Controls;
     using Perspex.Layout;
 
@@ -16,12 +17,12 @@ namespace Perspex.UnitTests
     {
         public Size ClientSize
         {
-            get { throw new NotImplementedException(); }
+            get { return new Size(100, 100); }
         }
 
         public ILayoutManager LayoutManager
         {
-            get { throw new NotImplementedException(); }
+            get { return new Mock<ILayoutManager>().Object; }
         }
     }
 }
diff --git a/Perspex/Controls/TestBorder.cs b/Perspex/Controls/TestBorder.cs
deleted file mode 100644
index f143b26820..0000000000
--- a/Perspex/Controls/TestBorder.cs
+++ /dev/null
@@ -1,32 +0,0 @@
-// -----------------------------------------------------------------------
-// <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.Media;
-
-    public class TestBorder : Decorator
-    {
-        public override void Render(IDrawingContext context)
-        {
-            Brush background = this.Background;
-            Brush borderBrush = this.BorderBrush;
-            double borderThickness = this.BorderThickness;
-
-            if (background != null)
-            {
-                context.FillRectange(background, new Rect(this.Bounds.Size));
-            }
-
-            if (borderBrush != null && borderThickness > 0)
-            {
-                context.DrawRectange(new Pen(borderBrush, borderThickness), new Rect(this.Bounds.Size));
-            }
-        }
-    }
-}
diff --git a/Perspex/Perspex.csproj b/Perspex/Perspex.csproj
index ed7c7cdbc9..b3f86487de 100644
--- a/Perspex/Perspex.csproj
+++ b/Perspex/Perspex.csproj
@@ -71,7 +71,6 @@
     <Compile Include="Application.cs" />
     <Compile Include="Classes.cs" />
     <Compile Include="Contract.cs" />
-    <Compile Include="Controls\TestBorder.cs" />
     <Compile Include="Controls\Border.cs" />
     <Compile Include="Controls\Button.cs" />
     <Compile Include="Controls\ContentPresenter.cs" />
diff --git a/Perspex/PerspexProperty.cs b/Perspex/PerspexProperty.cs
index 4d3ac7c9a8..c3056d1bca 100644
--- a/Perspex/PerspexProperty.cs
+++ b/Perspex/PerspexProperty.cs
@@ -162,6 +162,11 @@ namespace Perspex
 
             this.defaultValues.Add(type, defaultValue);
         }
+
+        public override string ToString()
+        {
+            return this.Name;
+        }
     }
 
     /// <summary>
diff --git a/Perspex/Styling/Style.cs b/Perspex/Styling/Style.cs
index 3367c171d7..0fc7e98415 100644
--- a/Perspex/Styling/Style.cs
+++ b/Perspex/Styling/Style.cs
@@ -41,11 +41,14 @@ namespace Perspex.Styling
         public void Attach(IStyleable control)
         {
             string description = "Style " + this.Selector.ToString();
-            IObservable<bool> activator = this.Selector.GetActivator(control);
+            StyleActivator activator = this.Selector.GetActivator(control);
 
-            foreach (Setter setter in this.Setters)
+            if (!(activator.CurrentValue == false && activator.HasCompleted))
             {
-                control.SetValue(setter.Property, setter.Value, activator);
+                foreach (Setter setter in this.Setters)
+                {
+                    control.SetValue(setter.Property, setter.Value, activator);
+                }
             }
         }
     }
diff --git a/Perspex/Styling/StyleActivator.cs b/Perspex/Styling/StyleActivator.cs
index e05a8ab3e1..124021fbb7 100644
--- a/Perspex/Styling/StyleActivator.cs
+++ b/Perspex/Styling/StyleActivator.cs
@@ -27,8 +27,6 @@ namespace Perspex.Styling
 
         List<IObserver<bool>> observers = new List<IObserver<bool>>();
 
-        bool last = false;
-
         public StyleActivator(
             IEnumerable<IObservable<bool>> inputs, 
             string description,
@@ -54,18 +52,30 @@ namespace Perspex.Styling
             }
         }
 
+        public bool CurrentValue
+        {
+            get;
+            private set;
+        }
+
         public string Description
         {
             get;
             private set;
         }
 
+        public bool HasCompleted
+        {
+            get;
+            private set;
+        }
+
         public IDisposable Subscribe(IObserver<bool> observer)
         {
             Contract.Requires<ArgumentNullException>(observer != null);
 
             this.observers.Add(observer);
-            observer.OnNext(last);
+            observer.OnNext(CurrentValue);
             return Disposable.Create(() => this.observers.Remove(observer));
         }
 
@@ -87,10 +97,10 @@ namespace Perspex.Styling
                     throw new InvalidOperationException("Invalid Activator mode.");
             }
 
-            if (current != last)
+            if (current != CurrentValue)
             {
                 this.Push(current);
-                last = current;
+                CurrentValue = current;
             }
         }
 
@@ -107,6 +117,8 @@ namespace Perspex.Styling
                 {
                     subscription.Dispose();
                 }
+
+                this.HasCompleted = true;
             }
         }
 
diff --git a/Perspex/Styling/Styler.cs b/Perspex/Styling/Styler.cs
index 671c8fe948..e56bc9e66c 100644
--- a/Perspex/Styling/Styler.cs
+++ b/Perspex/Styling/Styler.cs
@@ -18,7 +18,23 @@ namespace Perspex.Styling
         {
             IVisual visual = control as IVisual;
             IStyled styleContainer = visual.GetVisualAncestorOrSelf<IStyled>();
-            styleContainer.Styles.Attach(control);
+            Application.Current.Styles.Attach(control);
+            this.ApplyStyles(control, styleContainer);
+        }
+
+        private void ApplyStyles(IStyleable control, IStyled container)
+        {
+            if (container != null)
+            {
+                IVisual visual = container as IVisual;
+
+                if (visual != null)
+                {
+                    this.ApplyStyles(control, visual.GetVisualAncestor<IStyled>());
+                }
+
+                container.Styles.Attach(control);
+            }
         }
     }
 }
diff --git a/Perspex/Themes/Default/ButtonStyle.cs b/Perspex/Themes/Default/ButtonStyle.cs
index df4ff3cadc..2d6e6d3ffd 100644
--- a/Perspex/Themes/Default/ButtonStyle.cs
+++ b/Perspex/Themes/Default/ButtonStyle.cs
@@ -55,9 +55,6 @@ namespace Perspex.Themes.Default
         {
             Border border = new Border();
             border.Id = "border";
-            border.SetValue(Border.BackgroundProperty, control.GetObservable(Button.BackgroundProperty));
-            border.SetValue(Border.BorderBrushProperty, control.GetObservable(Button.BorderBrushProperty));
-            border.SetValue(Border.BorderThicknessProperty, control.GetObservable(Button.BorderThicknessProperty));
             border.Padding = new Thickness(3);
             ContentPresenter contentPresenter = new ContentPresenter();
             contentPresenter.SetValue(ContentPresenter.ContentProperty, control.GetObservable(Button.ContentProperty));
diff --git a/Perspex/Themes/Default/DefaultTheme.cs b/Perspex/Themes/Default/DefaultTheme.cs
index 4c53d9fc0b..daa183be80 100644
--- a/Perspex/Themes/Default/DefaultTheme.cs
+++ b/Perspex/Themes/Default/DefaultTheme.cs
@@ -11,7 +11,7 @@ namespace Perspex.Themes.Default
     {
         public DefaultTheme()
         {
-            //this.Add(new ButtonStyle());
+            this.Add(new ButtonStyle());
         }
     }
 }
diff --git a/TestApplication/Program.cs b/TestApplication/Program.cs
index e643cbd68c..fa8f632819 100644
--- a/TestApplication/Program.cs
+++ b/TestApplication/Program.cs
@@ -50,28 +50,6 @@ namespace TestApplication
 
             Window window = new Window
             {
-                //Content = new TestBorder 
-                //{ 
-                //    Margin = new Thickness(10),
-                //    Styles = new Styles 
-                //    { 
-                //        new Style(new Selector().OfType<TestBorder>())
-                //        {
-                //            Setters = new[]
-                //            {
-                //                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xff0000ff)),
-                //            }
-                //        },
-                //        new Style(new Selector().OfType<TestBorder>().Class(":mouseover"))
-                //        {
-                //            Setters = new[]
-                //            {
-                //                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xffff0000)),
-                //            }
-                //        },
-                //    }
-                //},
-
                 Content = new Button
                 {
                     Content = "Hello World",