diff --git a/Perspex.Controls/DataTemplate.cs b/Perspex.Controls/DataTemplate.cs
index 6d238a7f9b..ab674b53ed 100644
--- a/Perspex.Controls/DataTemplate.cs
+++ b/Perspex.Controls/DataTemplate.cs
@@ -9,7 +9,7 @@ namespace Perspex.Controls
     using System;
     using System.Reflection;
 
-    public class DataTemplate
+    public class DataTemplate : IDataTemplate
     {
         public static readonly DataTemplate Default =
             new DataTemplate(typeof(object), o => new TextBlock { Text = o.ToString() });
@@ -41,6 +41,16 @@ namespace Perspex.Controls
         {
             return t.GetTypeInfo().IsAssignableFrom(o.GetType().GetTypeInfo());
         }
+
+        bool IDataTemplate.Match(object data)
+        {
+            return this.Match(data);
+        }
+
+        Control IDataTemplate.Build(object data)
+        {
+            return this.Build(data);
+        }
     }
 
     public class DataTemplate<T> : DataTemplate
diff --git a/Perspex.Controls/DataTemplateExtensions.cs b/Perspex.Controls/DataTemplateExtensions.cs
index 576aa3beb2..fb937e7461 100644
--- a/Perspex.Controls/DataTemplateExtensions.cs
+++ b/Perspex.Controls/DataTemplateExtensions.cs
@@ -14,7 +14,7 @@ namespace Perspex.Controls
     {
         public static Control ApplyDataTemplate(this Control control, object data)
         {
-            DataTemplate result = control.FindDataTemplate(data);
+            IDataTemplate result = control.FindDataTemplate(data);
 
             if (result != null)
             {
@@ -30,12 +30,12 @@ namespace Perspex.Controls
             }
         }
 
-        public static DataTemplate FindDataTemplate(this Control control, object data)
+        public static IDataTemplate FindDataTemplate(this Control control, object data)
         {
             // TODO: This needs to traverse the logical tree, not the visual.
             foreach (var i in control.GetSelfAndVisualAncestors().OfType<Control>())
             {
-                foreach (DataTemplate dt in i.DataTemplates.Reverse())
+                foreach (IDataTemplate dt in i.DataTemplates.Reverse())
                 {
                     if (dt.Match(data))
                     {
@@ -48,7 +48,7 @@ namespace Perspex.Controls
 
             if (global != null)
             {
-                foreach (DataTemplate dt in global.DataTemplates.Reverse())
+                foreach (IDataTemplate dt in global.DataTemplates.Reverse())
                 {
                     if (dt.Match(data))
                     {
diff --git a/Perspex.Controls/DataTemplates.cs b/Perspex.Controls/DataTemplates.cs
index 7de64339ed..c06b5bbf6f 100644
--- a/Perspex.Controls/DataTemplates.cs
+++ b/Perspex.Controls/DataTemplates.cs
@@ -8,7 +8,7 @@ namespace Perspex.Controls
 {
     using Perspex.Collections;
 
-    public class DataTemplates : PerspexList<DataTemplate>
+    public class DataTemplates : PerspexList<IDataTemplate>
     {
     }
 }
diff --git a/Perspex.Controls/Generators/TreeItemContainerGenerator.cs b/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
index 17ce092309..e8688aa3ba 100644
--- a/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
+++ b/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
@@ -52,7 +52,7 @@ namespace Perspex.Controls.Generators
 
         private TreeDataTemplate GetTreeDataTemplate(object item)
         {
-            DataTemplate template = this.Owner.FindDataTemplate(item);
+            IDataTemplate template = this.Owner.FindDataTemplate(item);
 
             if (template == null)
             {
diff --git a/Perspex.Controls/IDataTemplate.cs b/Perspex.Controls/IDataTemplate.cs
new file mode 100644
index 0000000000..30d47d6bc5
--- /dev/null
+++ b/Perspex.Controls/IDataTemplate.cs
@@ -0,0 +1,15 @@
+// -----------------------------------------------------------------------
+// <copyright file="IDataTemplate.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Controls
+{
+    public interface IDataTemplate
+    {
+        bool Match(object data);
+
+        Control Build(object data);
+    }
+}
diff --git a/Perspex.Controls/Perspex.Controls.csproj b/Perspex.Controls/Perspex.Controls.csproj
index e8f03d97cb..4ca024736f 100644
--- a/Perspex.Controls/Perspex.Controls.csproj
+++ b/Perspex.Controls/Perspex.Controls.csproj
@@ -41,6 +41,7 @@
     <Compile Include="Platform\IPopupImpl.cs" />
     <Compile Include="Platform\ITopLevelImpl.cs" />
     <Compile Include="Popup.cs" />
+    <Compile Include="IDataTemplate.cs" />
     <Compile Include="RadioButton.cs" />
     <Compile Include="CheckBox.cs" />
     <Compile Include="ColumnDefinition.cs" />
diff --git a/Perspex.Controls/Presenters/ContentPresenter.cs b/Perspex.Controls/Presenters/ContentPresenter.cs
index 4646a05f67..6a121dbb71 100644
--- a/Perspex.Controls/Presenters/ContentPresenter.cs
+++ b/Perspex.Controls/Presenters/ContentPresenter.cs
@@ -110,7 +110,7 @@ namespace Perspex.Controls.Presenters
                 }
                 else
                 {
-                    DataTemplate dataTemplate = this.FindDataTemplate(content);
+                    IDataTemplate dataTemplate = this.FindDataTemplate(content);
 
                     if (dataTemplate != null)
                     {
diff --git a/Perspex.SceneGraph/LogicalTree/LogicalExtensions.cs b/Perspex.SceneGraph/LogicalTree/LogicalExtensions.cs
new file mode 100644
index 0000000000..98c7ec6a70
--- /dev/null
+++ b/Perspex.SceneGraph/LogicalTree/LogicalExtensions.cs
@@ -0,0 +1,80 @@
+// -----------------------------------------------------------------------
+// <copyright file="LogicalExtensions.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.LogicalTree
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public static class LogicalExtensions
+    {
+        public static IEnumerable<ILogical> GetLogicalAncestors(this ILogical logical)
+        {
+            Contract.Requires<NullReferenceException>(logical != null);
+
+            logical = logical.LogicalParent;
+
+            while (logical != null)
+            {
+                yield return logical;
+                logical = logical.LogicalParent;
+            }
+        }
+
+        public static IEnumerable<ILogical> GetSelfAndLogicalAncestors(this ILogical logical)
+        {
+            yield return logical;
+
+            foreach (var ancestor in logical.GetLogicalAncestors())
+            {
+                yield return ancestor;
+            }
+        }
+
+       
+        public static IEnumerable<ILogical> GetLogicalChildren(this ILogical logical)
+        {
+            return logical.LogicalChildren;
+        }
+
+        public static IEnumerable<ILogical> GetLogicalDescendents(this ILogical logical)
+        {
+            foreach (ILogical child in logical.LogicalChildren)
+            {
+                yield return child;
+
+                foreach (ILogical descendent in child.GetLogicalDescendents())
+                {
+                    yield return descendent;
+                }
+            }
+        }
+
+        public static ILogical GetLogicalParent(this ILogical logical)
+        {
+            return logical.LogicalParent;
+        }
+
+        public static T GetLogicalParent<T>(this ILogical logical) where T : class
+        {
+            return logical.LogicalParent as T;
+        }
+
+        public static IEnumerable<ILogical> GetLogicalSiblings(this ILogical logical)
+        {
+            ILogical parent = logical.LogicalParent;
+
+            if (parent != null)
+            {
+                foreach (ILogical sibling in parent.LogicalChildren)
+                {
+                    yield return sibling;
+                }
+            }
+        }
+    }
+}
diff --git a/Perspex.SceneGraph/Perspex.SceneGraph.csproj b/Perspex.SceneGraph/Perspex.SceneGraph.csproj
index 3760967f12..577272b72c 100644
--- a/Perspex.SceneGraph/Perspex.SceneGraph.csproj
+++ b/Perspex.SceneGraph/Perspex.SceneGraph.csproj
@@ -92,6 +92,7 @@
     <Compile Include="Thickness.cs" />
     <Compile Include="Vector.cs" />
     <Compile Include="Visual.cs" />
+    <Compile Include="LogicalTree\LogicalExtensions.cs" />
     <Compile Include="VisualTree\VisualExtensions.cs" />
   </ItemGroup>
   <ItemGroup>