$scrollbar = $mw->Scrollbar(-orient => 'vertical');
$listbox = $mw->Listbox (-yscrollcommand => ['set' => $scrollbar]);
$scrollbar->configure(-command => ['yview' => $listbox]);
...pack stuff...

##</code><code>##

$scrollbar->configure(-command => ['yview' => $listboxA, 'yview' => $listboxB]);

##</code><code>##

Frame1 (title)
  List_box_1
  X_scroll_bar
Frame2 (title)
  List_box_1
  X_scroll_bar
Y_scroll_bar (links to List_box_1, List_box_2)