Hello Monks!

I built an application in Perl/Tk, but there seems to be some memory problem. The code is a bit longish, but I managed to locate where the problem comes from. Every time I use update on the MainWindow in order to update the ProgressBar, there is a memory build up. So here is a very short Perl/TK application:

use strict;
use Tk;
use Tk::ProgressBar;


my $mw=MainWindow->new;
my $percent;
my $pb=$mw->ProgressBar(
   -height      => 0,
   -width       => 20,
   -length      => 100,
   -colors=>[0,'blue'],
   -blocks=>100,
   -variable=>\$percent)->pack;

my $btn=$mw->Button(
   -command => \&show_progress,
   -text    => 'Run program',
  )->pack;
  
MainLoop;

sub show_progress{
    for (1..100) {
        $percent=rand(100);
        $mw->update();
    }
}

[download]

So I was clicking the button on this simple application and was watching the memory usage with the task manager (XP). Every time I click on the button there is memory build up and I just can not figure where this is coming from. It just never goes down.

Click......Memory
1........10,428K
2........10,512K
3........10,576K
4........10,648K
5........10,716K
6........10,780K
7........10,852K
.
etc

I now these are very small increments, but is this some sort of memory leak with the ProgressBar or something else that I am missing here?
This is extremely simple application. When I did a bit more complicated stuff, the memory build up was enormous. A way to overcome this is closing the application every time, but it is a bit annoying. It seems that this is only associated with the ProgressBar widget, not with the update. I tried only update on the ProgressBar widget, but it does not make a difference.

Could you please help me here?
I am using
Perl/Tk 804.027-r6
Perl v5.8.8 MSWin32-x86-multi-thread

In reply to TK::ProgressBar and update memory build up by saskak

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