Form to setup a GTK GC --- anyone have something similar?

[Paul Bunyk <paul pbunyk physics sunysb edu>]

Operating System: Linux 2.2.4 #5 SMP Tue Mar 23 19:17:00 EST 1999
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Hello, dear GTK developers!

I wonder if someone have already written a GTK form/widget which allows
one to setup all properties of a Graphical Contex (GC) structure
(GdkGCValues). I'm thinking about writing a small GPLed VLSI layout
viewer/later editor in GTK and I want each design layer to have its
own GC. Then all layer presentation properties can be trivially edited with
such a form. 

If you do not have such a widget handy but feel that you might find it
useful too, drop me a line and we will try to roll something up together!

Sincerely,

Paul