I really don't like using canvases for platform controls
It's not a very good idea at all.
To my knowledge, there isn't a *cross-platform* GDI module
It's called wxMax :-p
that can be easily used with MaxGUI
Ah... well... no.
But with wxMax you can create all kinds of interesting looking controls with the GDI, which work the same on all platforms.
Maybe someone can write one for MaxGUI?