This bug is due to the version of Togl used.
On Python-opengl I have found the following information
"""
Deprecated PyOpenGL Dependencies:
* Togl v2.0
* Only required if you want to use PyOpenGL with Tk-based
GUI programs
* The script src/togl.py in the PyOpenGL source
distribution will attempt to download and unpack a
binary Togl package into the correct directory within
your current PyOpenGL installation
Note that Togl support is deprecated, it's there for legacy code (once
you install Togl), but you should choose a GUI library that has OpenGL
support built-in for any new development. Togl support has been dropped
due the historic headache of maintaining the package. If you would like
to see better Togl support in PyOpenGL, consider volunteering on the
mailing list to develop, test and maintain the packaging.
"""
I would upgrade togl to 2.0 as soon as netgen would support togl 2.0.
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