use strict;
use Tk;

my @cbValues;
my $mw = MainWindow->new;

$mw->Button(
   -text => "Print Selected",
   -command => \&printSelected
)->pack;

my $rows = $mw->Frame->pack;

## $rows will serve as a gridded container for each
## of the checkbutton rows. This should be roughly 
## similar to using Tk::Table, but less hassle
## for a quick & dirty example.

for my $row (0 .. 9) {
   $rows->Label(-text => $row)->grid(
      $rows->Checkbutton(
         -command => [\&select, $row],
         -variable => \$cbValues[$row]));
}

MainLoop;

sub select 
{
   my $i = shift;
   if ($cbValues[$i]) { 
      print "Selected $i\n"; 
   } else { 
      print "Deselected: $i\n"; 
   }   
}

sub printSelected
{
   my $row = 0;
   print "\nSelected:\n";
   foreach my $val (@cbValues) {
      print "$row selected\n" if $val;
      $row++;
   }
}