I've raped the Calculator example from here
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?GladeVCP_Custom_Widgets

, "ported" it to PyGObject (gtk3) and added some "features" for showing the 
"notify::visible" functionality.

https://github.com/tinkercnc/gladvcp-test

Hope it helps.

And for gtk2 maybe this helps
http://stackoverflow.com/questions/1667525/visibility-notify-event-in-pygtk

-- 
"In der Wissenschaft siegt nie eine neue Theorie,
nur ihre Gegner sterben nach und nach"

Max Planck


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