Setup TreeDataTemplate Content property.

src/Markup/Perspex.Markup.Xaml/Context/PerspexWiringContext.cs

@@ -116,6 +116,7 @@ namespace Perspex.Markup.Xaml.Context
             var contentProperties = new Collection<ContentPropertyDefinition>
             {
                 new ContentPropertyDefinition(typeof(ContentControl), "Content"),
+                new ContentPropertyDefinition(typeof(DataTemplate), "Content"),
                 new ContentPropertyDefinition(typeof(Decorator), "Child"),
                 new ContentPropertyDefinition(typeof(ItemsControl), "Items"),
                 new ContentPropertyDefinition(typeof(GradientBrush), "GradientStops"),
@@ -123,7 +124,7 @@ namespace Perspex.Markup.Xaml.Context
                 new ContentPropertyDefinition(typeof(Style), "Setters"),
                 new ContentPropertyDefinition(typeof(TextBlock), "Text"),
                 new ContentPropertyDefinition(typeof(TextBox), "Text"),
-                new ContentPropertyDefinition(typeof(DataTemplate), "Content"),
+                new ContentPropertyDefinition(typeof(TreeDataTemplate), "Content"),
             };
 
             contentPropertyProvider.AddAll(contentProperties);

src/Markup/Perspex.Markup.Xaml/Templates/DataTemplate.cs

@@ -8,7 +8,6 @@ using Perspex.Controls.Templates;
 
 namespace Perspex.Markup.Xaml.Templates
 {
-    [ContentProperty("Content")]
     public class DataTemplate : IDataTemplate
     {
         public Type DataType { get; set; }

src/Markup/Perspex.Markup.Xaml/Templates/TreeDataTemplate.cs

@@ -10,7 +10,6 @@ using Perspex.Markup.Xaml.Binding;
 
 namespace Perspex.Markup.Xaml.Templates
 {
-    [ContentProperty("Content")]
     public class TreeDataTemplate : ITreeDataTemplate
     {
         public Type DataType { get; set; }