[pygtk] Pygtk problems with DrawingArea redraw

[Antonio Caruso]

Hi,

I cannot understand why the program below, is not able to update the
draw when I push the button.

I.e. when the button is pushed the code in Plot::calc is executed.
At the end of this code I must emit a expose-event but the call
to self.queue_draw_area is not working at all..

help, please.

Thanks,
 A. Caruso
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