How do I structure MVVM with Collections?

Question

I\'m having trouble understanding how to apply the MVVM pattern when Lists/Collections are involved.

Say the MainModel has a few properties and methods, as

Answer 1

Here is an answer that I think addresses this issue very nicely using an ObservableViewModelCollection

It's nice and lazy. It takes an ObservableCollection and a ViewModelFactory in the ctor. I like it because it keeps state at the model layer where it belongs. User operations on the GUI can invoke commands at the VM which manipulate the M via public methods on the M. Any resulting changes at the M layer will be automatically handled by the class in this link.

https://stackoverflow.com/q/2177659/456490

Note my comment regarding SL vs. WPF