Use commands, create a class derived from ICommand, declare in the class that have access to user controles and is accessible in your xaml and bind button with that command. See here for detailes.
Another option is to add an event handler for the MenuItem. Click event to the TreeViewItem as you create it.
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.