[pygtk] how to write popup menus?

[Rick Ree]

I'm working on a program that will allow the graphical manipulation of
phylogenetic trees using pygnome.  I would like to be able to right-click
on a canvas item (e.g. a tree node) and have a popup menu appear, with
operations to perform on that node. 

I haven't come across any python examples for popup menus.  Does anyone
have any hints/suggestions/example pseudocode?

Thanks!  Cheers,
Rick

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