Tkinter and Listbox questions

[paul kölle]

Hi all,

I have two instances of a custom Listbox in my frame with 
selectmode=multiple. When I leave one listbox to select items in the 
other, all entries in the fist one get lost (cleared). Is this 'normal'? 
Do I really have to catch the 'leave' event and restore the selection 
when reentering?

thanks
  Paul