Heh - probably not MPW I'm afraid, unless you want to tackle MacApp and AdLib. I haven't used CodeWarrior since Pro version 2, but back then CodeWarrior with PowerPlant and the associated visual editor (kind of like a souped up ResEdit) supported pretty quick GUI development. I expect the same tools are there (and most likely enhanced) in later versions. I've written a few PowerPlant apps, and it really is a very nice system.

Ken