I ported all the code from the latest RI Infrastructure/Behaviors folder as well as PopStyle into my SIlverlight 4 app. I reference it in my Shell.xaml in the same manner that is used in the RI. When I add a View, and then Activate that view, I receive:
Error HRESULT E_FAIL has been returned from a call to a COM component.
The RI runs fine on my machine. Clearly I'm missing something however I can't find it. Any help is appreciated. Thanks.