Finding widget position in table or box

["Daniel Haude" <dunno stoptrick com>]

Hello,

say I have a table filled with some widgets. Now I'd like to replace one  
of these widgets (A) with some other widget B. I guess I just go ahead and  
destroy widget A, and then attach widget B. My problem is that in order to  
do that, I need to know the position (row and column) that A had within  
the table.

To put the question simpler: Given a table and a widget within the table  
(or box), how can I find the position of the widget within the table (or  
box)?

Thanks,
--Daniel