MVVM: How to handle interaction between nested ViewModels?

Question

I\'m been experimenting with the oft-mentioned MVVM pattern and I\'ve been having a hard time defining clear boundaries in some cases. In my application, I have a dialog that a

Answer 1

I recently experimented with Unity (Microsoft Enterprise library) to use dependency injection. That might be a route to go when using interfaces that completely define what both viewmodels need to no from each other. MEF would be another option for dependency injection I'm aware of.

HTH