Another option is to pack the buttons into a Pane inside the main window. A benefit to this is you can make just a portion of the window scrollable if you should so desire.
use warnings;
use strict;
use Tk;
use Tk::Pane;
my $top = MainWindow->new;
my $pane = $top->Scrolled('Pane',
-scrollbars => 'e',
)->pack(-expand => 'y', -fill => 'both');
for (0 .. 9)
{
$pane->Button(
-text => $_,
-width => 15,
-command => [sub{print "Button $_[0] Pressed\n"},$_],
)->pack;
}
$top->Button(
-text => 'Quit',
-command => sub{$top->destroy},
)->pack;
MainLoop;
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