Incidentally, I absolutely do not mind if you change the internals to fit your needs (It's not as though I could do anything about it, even if I did mind..), Hans initially created and released it so that it could useful - even if that use is to serve as a base for others to modify. Send me your changes if you like, and they may find their way into the codebase.

I would ask, however, and again obviously I can't enforce it, that when you do make changes that you rename it something other than MListbox. It doesn't have to be completely different (MyMListbox, MListbox2, AceMListbox, etc) but enough to distinguish it from the original. Thanks!