use strict;
use Tk;
use Tk::TiedListbox;

my $top = MainWindow->new;
my $f = $top->Frame->pack(-expand => 'yes', -fill => 'both');
my $l1 = $f->ScrlListbox(-relief => 'flat',
                         -exportselection => 0,
                         -selectmode => 'extended',-height => 20);
my $l2 = $f->ScrlListbox(-relief => 'flat', 
                         -exportselection => 0,
                         -selectmode => 'extended',-height => 10);
my $l3 = $f->ScrlListbox(-relief => 'flat', 
                         -exportselection => 0,
                         -selectmode => 'extended',-height => 20,
                         # -font => 'clb6x10'
                         );
my ($bv1,$bv2);
my $b1 = $f->Checkbutton(-text => 'tie selection',
                         -variable => \$bv1,
                         -command => [\&set_tie,\$bv1,\$bv2]);
my $b2 = $f->Checkbutton(-text => 'tie scroll',
                         -variable => \$bv2,
                         -command => [\&set_tie,\$bv1,\$bv2]);
$b1->pack(-side => 'bottom');
$b2->pack(-side => 'bottom');
$l1->pack(-expand => 'yes', -side => 'left');
$l2->pack(-expand => 'yes', -side => 'left');
$l3->pack(-expand => 'yes', -side => 'left');

my $id;
foreach $id (0..300){
  $l1->insert('end', $id) if $id<100;
  $l2->insert('end', $id);
  $l3->insert('end', $id);
}

$b1->invoke;
$b2->invoke;

MainLoop();

sub set_tie {
  my($b1,$b2)=@_;
  my($x1,$x2,$x3)=map($_->Subwidget('scrolled'),$l1,$l2,$l3);
  $x1->tie('all',      [$x2,$x3]),return if($$b1 && $$b2);
  $x1->tie('selection',[$x2,$x3]),return if($$b1);
  $x1->tie('scroll',   [$x2,$x3]),return if($$b2);
  $x1->untie,$x2->untie,$x3->untie;
}