foreach my $listbox ( @$raListboxes )
{
    $listbox->configure(
       -yscrollcomand =>
       [
          \&scrollListboxes,
          $scrollbar,
          $listbox,
          $raListboxes
       ]);
}

$scrollbar->configure(
   -command => sub
   {
       foreach my $listbox ( @$raListboxes )
       {
           $listbox->yview(@_);
       }
   });