You are trying to bind a ObservableCollection.
It looks to me like your trying to display grouped data in a single control from a single (nested) data source, in which case you should consider using the LongListSelector control from the Silverlight Toolkit for WP7. WindowsPhoneGeek has a good blog post about how to use it in a similar situation to yours.
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.