In last few days, I tried to experiment with the scrolling table implemented in 
canvas, started from this example: 
http://code.activestate.com/recipes/580793-tkinter-table-with-scrollbars/. 
Everything works fine until I moved the scrolling_area instance (which the 
canvas is in) from column=0 to column=1.

The canvas has a binding:
        self.canvas.bind('<Configure>', self._on_canvas_configure)

After this movement, the callback was only triggered when dragging the root 
widget to resize canvas vertically, but not horizontally.

Event seems has OS involved(it's MS Windows XP in my case). How to debug this 
kind of problem, under pdb?

Best Regards,
Jach Fong
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