Removed Ignore attribute from SimpleLoadTests so the tests in the class will be executed.

Made some modifications to XamlParser so it aligns with the official XamlReader and the SimpleLoadTests will pass.

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

@@ -7,7 +7,6 @@ using NUnit.Framework;
 namespace ICSharpCode.WpfDesign.Tests.XamlDom
 {
 	[TestFixture]
-	[Ignore("Broken on .NET 4")]
 	public class SimpleLoadTests : TestHelper
 	{
 		[Test]

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

@@ -265,7 +265,7 @@ namespace ICSharpCode.WpfDesign.XamlDom
 		
 		void ParseObjectContent(XamlObject obj, XmlElement element, XamlPropertyInfo defaultProperty, XamlTextValue initializeFromTextValueInsteadOfConstructor)
 		{
-			XamlPropertyValue setDefaultValueTo = null;
+			bool isDefaultValueSet = false;
 			object defaultPropertyValue = null;
 			XamlProperty defaultCollectionProperty = null;
 			
@@ -290,11 +290,6 @@ namespace ICSharpCode.WpfDesign.XamlDom
 						continue;
 					
 					if (ObjectChildElementIsPropertyElement(childElement)) {
-						// I don't know why the official XamlReader runs the property getter
-						// here, but let's try to imitate it as good as possible
-						if (defaultProperty != null && !defaultProperty.IsCollection) {
-							defaultProperty.GetValue(obj.Instance);
-						}
 						ParseObjectChildElementAsPropertyElement(obj, childElement, defaultProperty, defaultPropertyValue);
 						continue;
 					}
@@ -307,23 +302,16 @@ namespace ICSharpCode.WpfDesign.XamlDom
 						defaultCollectionProperty.ParserAddCollectionElement(null, childValue);
 						CollectionSupport.AddToCollection(defaultProperty.ReturnType, defaultPropertyValue, childValue);
 					} else {
-						if (setDefaultValueTo != null)
+						if (defaultProperty == null)
+							throw new XamlLoadException("This element does not have a default value, cannot assign to it");
+						
+						if (isDefaultValueSet)
 							throw new XamlLoadException("default property may have only one value assigned");
-						setDefaultValueTo = childValue;
-					}
-				}
-			}
 						
-			if (defaultProperty != null && !defaultProperty.IsCollection && !element.IsEmpty) {
+						obj.AddProperty(new XamlProperty(obj, defaultProperty, childValue));
-				// Runs even when defaultValueSet==false!
+						isDefaultValueSet = true;
-				// Again, no idea why the official XamlReader does this.
-				defaultProperty.GetValue(obj.Instance);
 					}
-			if (setDefaultValueTo != null) {
-				if (defaultProperty == null) {
-					throw new XamlLoadException("This element does not have a default value, cannot assign to it");
 				}
-				obj.AddProperty(new XamlProperty(obj, defaultProperty, setDefaultValueTo));
 			}
 		}