Change top button return module

Hi,

I'm attempting to change the return module for a top button in one of my subpanels. For example, if I choose to create an opportunity from the contacts detail view, when I save the new opportunity I will be redirected back to the contacts detail view. I would instead like to be redirected to the new opportunities detail view. I can't seem to get this to work. I've tried messing with the layoutdefs but have had no luck yet.