GtkCombo: how do i ...

[Paul Barton-Davis <pbd Op Net>]

i want to use GtkCombo, but only pay attention to the value of 
the entry once the popup has closed. if i use the "changed" signal of
the entry, i have to handle every change as the mouse moves up and
down the popup list. if i use the "activate" signal, then the user has
to press Return. is there a way to say "tell me when the user made a
selection from the popup list ?"

--p