WPF MVVM: How do ViewModels communicate with each other?

Question

I have a View which has 2 sub views on it and a ViewModel is assigned to each view:

ViewA - ViewModelA
{ 
   ViewB - ViewModelB
   ViewC - ViewModelC
}
         


        

Answer 1

The ViewModels usually 'inherit' relationships from the Model. And it's not wrong to add a relation when it makes sense.

It's perfectly OK for a ViewModel to have a property referring to another ViewModel.