tkinter listboxes

[rahulnag22 at yahoo.com]

I will give a simplified example of the problem at hand --

I have a case in which I have two listboxes - listbox1 and listbox2,
if I click on an item in listbox1 the item gets highlighted as
expected. Now if I click on an item in listbox2 the selected item in
listbox1 loses its highlight. My question is how do I keep the
listbox1 item from losing its highlight if I select an item in
listbox2 or to that matter any other widget.

Thanks
Rahul