I seem to be having a problem with my installation.  When I'm in the hanger and select a bomber the "set convergence" button doesn't appear.  Is there some trick that I'm missing?  I know I used to be able to do this and I would switch convergence depending on the alt I expect to bomb at but now my guns seem to be stuck on a convergence setting of about 400 ft which makes them useless in a bomber.  Please Help!!!