Best way to databind (WPF/Silverlight style) to an aggregation of a property on a collection inside a collection?

I do strongly recommend MVVM but when it comes to hierarchical models like this, you can save yourself a lot of grief if you're willing and able to make some simple modifications to the model classes themselves.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.