Using buttons on PDA

Is there a way to change the way in which the buttons on the PDA interact
with the program?  I suspect that answering this question requires the
information that I am using wxPython.  Currently, the scroll button will
permit me to change the selection of the current control, but I have not
found a way to tab to a different control.  I would like to control one
listctrl using the button -- and only that control.  It would also be nice
if I could assign useful functions to the buttons that now open the
calendar, mail, etc.
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