I think you hit on the issue in your last question. When you create a new ObservableCollection, you've disconnected from collection change tracking (adds and deletes). Instead of using OC, there are a number of other options worth considering.
In your case, it looks like EntitySet or EntityList may be the best options. For a full rundown of these types, take a look at my post on collection binding in RIA Services SP1 .
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.