After I add MVVM light, the app.xaml makes you give the default ResourceDictionary an x:key. Even then I can’t seem to get the Styles under MainPage.xaml to resolve to the key I provided. I tried to cheat and use Blend, but it crashes every time I open the modified project.
Steps to repro: Create new project (SL5 Navigation Application), then add MVVM Light via Add Library Package Reference.
Ah. ok… simply move inside the existing node. The error message made me think I needed to name the existing node and create a 2nd node.