When I try to open the Mastermind Sample in Blend I get an error about "Composite Transform" not being supported in a WPF application.

Is this a project setup problem in Blend or do you have custom XAML extensions that Blend doesn't understand. If so, how does this impact our ability to use Blend to build UIs?

Ok I found out that Composite Transform is a Silverlight only feature. In a WPF app, it's necessary to use Transform Group instead.

I switched the Apptype to Silverlight. Next problem: How do I get Blend to recognize the clr-namespace:NoesisGuiExtension?

All our extensions are being maintained here: https://github.com/Noesis/noesisgui-contrib

Thanks!