GTK-- OpenGL

[David Driver <driver andrew cmu edu>]

This question may have been answered already, but I had a look through
the archive and didn't find anything that specifically suited my
tastes.

I am trying to convert a program I wrote for my graphics class to use
GTK-- instead of XForms, and am looking for a simple OpenGL widget to
use.  I experimented with converting the sample code that Ivo Clarysse
posted back in November, since that's basically what I was doing with
XForms.  But I've come to the decision that I don't quite understand
the internals of GTK-- well enough to make the C code behave properly
with the C++.

So, does anyone know if such a widget exists for GTK--?  Or does anyone
have any pointers on the basic steps I would have to go through to create
one?

Thanks,
Dave.