Thanks to thp and Bundyo!

Could you elaborate a bit more on the Python syntax/technique required to do as you suggest? Or direct me to an example?

UPDATE: I now understand what you guys meant.

http://www.pygtk.org/pygtk2tutorial/sec-Events.html

The answer was to do a 'return False' in order for the normal mouse click event handling (like click & drag) to continue!