Surely MaxGUI needs attention in places where most people will find it useful.
Well, it seems there are a least two users that would have found it useful...
The Mac implementation of wxWidgets allows the use of MDI, except it works in a way where your Child windows are just child windows, not embedded ones... but it does as it would be expected, I suppose - same for Linux. On Windows, they are proper MDI parent/child frames.
I'm all for choice.
The more choice a developer has, the more stuff he can simply ignore. I'm sure most of the stuff I've implemented will never be used - except by Plash, probably.