Make DataTemplate-created controls namescopes.

src/Perspex.Controls/Templates/DataTemplateExtensions.cs

@@ -45,6 +45,8 @@ namespace Perspex.Controls.Templates
                         result = FuncDataTemplate.Default.Build(data);
                     }
 
+                    NameScope.SetNameScope((Control)result, new NameScope());
+
                     return result;
                 }
             }

tests/Perspex.Controls.UnitTests/ItemsControlTests.cs

@@ -381,6 +381,48 @@ namespace Perspex.Controls.UnitTests
             Assert.Equal(new[] { "Foo", "Bar" }, text);
         }
 
+        [Fact]
+        public void Control_Item_Should_Not_Be_NameScope()
+        {
+            var items = new object[]
+            {
+                new TextBlock(),
+            };
+
+            var target = new ItemsControl
+            {
+                Template = GetTemplate(),
+                Items = items,
+            };
+
+            target.ApplyTemplate();
+            target.Presenter.ApplyTemplate();
+
+            var item = target.Presenter.Panel.LogicalChildren[0];
+            Assert.Null(NameScope.GetNameScope((TextBlock)item));
+        }
+
+        [Fact]
+        public void DataTemplate_Created_Item_Should_Be_NameScope()
+        {
+            var items = new object[]
+            {
+                "foo",
+            };
+
+            var target = new ItemsControl
+            {
+                Template = GetTemplate(),
+                Items = items,
+            };
+
+            target.ApplyTemplate();
+            target.Presenter.ApplyTemplate();
+
+            var item = target.Presenter.Panel.LogicalChildren[0];
+            Assert.NotNull(NameScope.GetNameScope((TextBlock)item));
+        }
+
         private class Item
         {
             public Item(string value)

tests/Perspex.Controls.UnitTests/Presenters/ContentPresenterTests.cs

@@ -51,6 +51,32 @@ namespace Perspex.Controls.UnitTests.Presenters
             Assert.Equal("Foo", ((TextBlock)target.Child).Text);
         }
 
+        [Fact]
+        public void Control_Content_Should_Not_Be_NameScope()
+        {
+            var target = new ContentPresenter();
+
+            target.Content = new TextBlock();
+
+            Assert.Null(target.Child);
+            target.UpdateChild();
+            Assert.IsType<TextBlock>(target.Child);
+            Assert.Null(NameScope.GetNameScope((Control)target.Child));
+        }
+
+        [Fact]
+        public void DataTemplate_Created_Control_Should_Be_NameScope()
+        {
+            var target = new ContentPresenter();
+
+            target.Content = "Foo";
+
+            Assert.Null(target.Child);
+            target.UpdateChild();
+            Assert.IsType<TextBlock>(target.Child);
+            Assert.NotNull(NameScope.GetNameScope((Control)target.Child));
+        }
+
         [Fact]
         public void Should_Set_Childs_Parent_To_TemplatedParent()
         {