Where are the gnome menu (python) source files?

[Mark]

Hey,

i want to edit the gnome menu in the source but i can`t find it..
i`m looking for the source of this:
http://linux.unimelb.edu.au/server/course/fc3/images/gnome-menu.png

i`ve looked for all python files or all files with the name menu in it..
also all files with applet in it (it`s a gnome-panel applet)
but with no luck.

i just want to test some stuff with it.
i hope someone could tell me where i can find it.

Thanx in favor.
Mark.