pyGTK -- how to wait for modal dialog?

[Grant Edwards]

I've created a modal dialog box, but can't figure out how to
wait until the dialog is dismissed so I can find out which
button was pressed.

The C language GTK examples I've found all replace the gtk main
loop with one that does nothing until the dialog box is
destroyed.  Isn't there anything like wait-for-<something>
(where something is a window being displayed, destroyed, etc.).

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