XamlParser now supports attached property used on a derived class.

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/XamlDom/ExampleService.cs

@@ -67,5 +67,25 @@ namespace ICSharpCode.WpfDesign.Tests.XamlDom
 			// TODO: add this test, check for correct setting of NameScope
 			//TestHelperLog.Log("ExampleDependencyObject.OnPropertyChanged " + e.Property.Name);
 		}
+		
+		public static readonly DependencyProperty ExampleProperty = DependencyProperty.RegisterAttached(
+			"Example", typeof(string), typeof(ExampleDependencyObject)
+		);
+		
+		public static string GetExample(DependencyObject element)
+		{
+			TestHelperLog.Log("ExampleDependencyObject.GetExample");
+			return (string)element.GetValue(ExampleProperty);
+		}
+		
+		public static void SetExample(DependencyObject element, string value)
+		{
+			TestHelperLog.Log("ExampleDependencyObject.SetExample");
+			element.SetValue(ExampleProperty, value);
+		}
+	}
+	
+	public class DerivedExampleDependencyObject : ExampleDependencyObject
+	{
 	}
 }

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/XamlDom/SimpleLoadTests.cs

@@ -418,5 +418,18 @@ namespace ICSharpCode.WpfDesign.Tests.XamlDom
 </t:ExampleClass>
 			");
 		}
+		
+		[Test]
+		public void UsingAttachedPropertyOnDerivedClass()
+		{
+			TestLoading(@"
+<Window
+  xmlns=""http://schemas.microsoft.com/netfx/2007/xaml/presentation""
+  xmlns:t=""" + XamlTypeFinderTests.XamlDomTestsNamespace + @"""
+  xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
+  t:DerivedExampleDependencyObject.Example=""test"">
+</Window>
+			");
+		}
 	}
 }

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.XamlDom/Project/XamlParser.cs

@@ -478,6 +478,11 @@ namespace ICSharpCode.WpfDesign.XamlDom
 					return new XamlDependencyPropertyInfo((DependencyProperty)field.GetValue(null), true);
 				}
 			}
+			
+			if (elementType.BaseType != null) {
+				return TryFindAttachedProperty(elementType.BaseType, propertyName);
+			}
+			
 			return null;
 		}