Darius Clarke wrote:

Glad I could help. :)
Don't forget to give back to the community a little something of what you develop.

Oh yes I will, once the code is less embarrassing :-) It keeps changing. Actually, on that point, I've added several things to the OGLExtManager and GLExtConstants. What's the best way to package these changes ? Is there a tutorial ? I'm new to Squeak and I've never distributed any code...I understand Monticello is the preferred way these days ? Or changesets ?