Is it possible to position a newly created Toplevel widget relative to specific widget in another Toplevel widget?

for example: 
#!/usr/bin/perl -w
use strict;
use Tk;

my $w = MainWindow->new;

my $button;

$button = $w->Button(-text => "click me", -command => sub
{
    my $mw = $w->Toplevel;
    # here I need somehow position the $mw over the $button
    $mw->Label(-text => "hello")->pack();
})->pack;

MainLoop;

[download]
when I click the button I need a new window x/y absolute coordinates to be positioned right at the x/y absolute coordinates of the button, so the new window will overlap the button every time I click it.

UPD: problem solved using 'geometry' method
code for commented line is something like this: 
    my @wg = ($w->geometry =~ /\+(\d+)\+(\d+)/);
    my @bg = ($button->geometry =~ /\+(\d+)\+(\d+)/);
    $wg[$_] += $bg[$_] for (0..@wg-1);
    $mw->geometry("+$wg[0]+$wg[1]");

[download]

In reply to Perl/Tk widget coordinates, simple question by warpod

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