How to transfer execution control from textbox to user control when user pressed enter/numpad6 key?

This is not complete answer to your question but this So question will give you clue how to know that user has pressed the Numpad 6 key.

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.