Active widgets

[Marco Lettere <lettere di unipi it>]

how can I obtain a widget which is able to respond to mouse-click events
even if it is not a gtk button.
I would like to create a progress bar which grows on a click of mouse
button 1 and shrinks on a click of mouse button 2.
is this possible with gtk/gdk? how?
thanx,
M.
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