In practice, I've found the easiest way to work in this area is with a combination of things already mentioned or eluded to:

• widget demos are a handy start
• Mastering Tk adds things not obvious in the demos
• tools that generate code fill in most of the simple areas (vtk, specperl, glade, ZooZ). You'd be silly to rely on them completely, but they can give a start.

There's also the tutorial here with pointers to stuff... .

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