pygtk button right/middle click

[Grant Edwards]

I'm trying to figure out how to get a pygtk button respond to
somehting other than just a simple "left click".  With a standard
3-button mouse, X11 provides at least 9 different "click" types, but
the pygtk button only seems to support one of them.

[Yes, I know there are left-handled mouse configurations -- by "left"
click I'm using the common term to mean the primary mouse button.]

After googling for some time, I haven't found any good answers.  Some
people just say things like "use the button_release_event signal of
the button widget".

But, that signal is depricated (and AFAICT still doesn't make the
button actually respond to the left/middle click by "depressing" the
way it should).

Other answers are things like "you'll have to write you own button
class in C, not C++".

Is the gtk button widget really incapable of handling left or middle
mouse buttons or shift/ctrl/alt modifiers?

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