Override Dialog

Hello

I would like to create my own Override Dialog ( with another way of choosing the applicable methods )   just like cmd+R does. I already registered the shortcut cmd+alt+r but as I am not the greatest of UI Programmer I would prefer the source code for the Dialog to either use or at least copy the parts I need. The problem is, that I don't know where to look in the source code. Any hints?

Btw I already tried the mbeddr Target Chooser, but the TC always displays the full path to the methods, I only want the methods to be displayed just like the Override Dialog does.

Jochen