System.ArgumentNullException
       à System.RuntimeType.MakeGenericType(Type[] instantiation)
       à Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkUtil.GetRuntimeType(Type type)
       à Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkType.TryGetRuntimeType()
       à Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkUtil.EnsureRuntimeType(Type type)
       à Microsoft.VisualStudio.Shell.Design.VsTargetFrameworkProvider.GetRuntimeType(Type reflectionType)
       à MS.Internal.Package.VSIsolationProviderService.RemoteReferenceProxy.VsReflectionResolver.GetRuntimeType(Type reflectionType)
       à Microsoft.Windows.Design.Metadata.ReflectionMetadataContext.CachingReflectionResolver.GetRuntimeType(Type reflectionType)
       à Microsoft.Windows.Design.Metadata.ReflectionMetadataContext.Microsoft.Windows.Design.Metadata.IReflectionResolver.GetRuntimeType(Type reflectionType)
       à MS.Internal.Metadata.ClrType.get_RuntimeMember()
       à MS.Internal.Metadata.ClrMember`1.Microsoft.Windows.Design.Metadata.Reflection.IReflectionMember.get_MemberInfo()
       à MS.Internal.Metadata.ClrType.Equals(Object obj)
       à System.Collections.Generic.ObjectEqualityComparer`1.Equals(T x, T y)
       à System.Collections.Concurrent.ConcurrentDictionary`2.TryGetValue(TKey key, TValue& value)
       à Microsoft.Windows.Design.Metadata.Xaml.XamlExtensionImplementations.XamlMemberFor[TMember,TXaml](TMember member, Factory`2 factory)
       à MS.Internal.Design.Metadata.Xaml.XamlType.<GetAllAttachableProperties>d__7.MoveNext()
       à MS.Internal.Design.Metadata.Xaml.XamlType.<FindAttachableProperties>d__0.MoveNext()
       à Microsoft.Windows.Design.Metadata.Xaml.XamlExtensionImplementations.<FindAttachableProperties>d__7.MoveNext()
       à MS.Internal.VirtualModel.VirtualModelPropertyCollection.<GetUncachedProperties>d__0.MoveNext()
       à System.Linq.Buffer`1..ctor(IEnumerable`1 source)
       à System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
       à MS.Internal.VirtualModel.VirtualModelPropertyCollection.GetEnumerator()
       à MS.Internal.Designer.PropertyEditing.Model.Properties.ModelPropertyMerger.<GetFirstProperties>d__0.MoveNext()
       à MS.Internal.Designer.PropertyEditing.Views.PropertyEntryReader.RedraftEntries(IPropertyViewManager viewManager, Selection selection, Boolean attachedOnly, IEventCodeBehindProxy eventCodeBehindProxy, CategoryList categoryList)
       à MS.Internal.Designer.PropertyEditing.PropertyInspector.UpdateCategories(Selection selection, Boolean attachedOnly, IEntryReader entryReader)
       à MS.Internal.Designer.PropertyEditing.PropertyInspector.RefreshPropertyList(Boolean attachedOnly)
       à MS.Internal.Designer.PropertyEditing.PropertyInspector.OnSelectionChangedIdle()
       à MS.Internal.Designer.PropertyEditing.PropertyInspector.OnSelectionChangedIdleForced(Object sender, EventArgs e)
       à System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
       à System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       à MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)