It may be that you are not showing us enough code to reveal where the problem is.

I was intrigued by the idea of a GUI design where the geometry of certain widgets will change as a result of user (or data) activity at run-time. (Normally, it's not the sort of approach I would recommend -- consistent size and placement of widgets throughout the run-time of the GUI will tend to be an aid to consistent and correct usage. But I can imagine cases where changing the size of a widget dynamically could be useful.)

Anyway, just I wanted to see if I could change the size of a listbox easily, and it seems this is doable: 

#!/usr/bin/perl

use strict;
use Tk;

my $mw = MainWindow->new;
my $btnframe = $mw->Frame()->pack(-side => 'top');
my $lstframe = $mw->Frame()->pack(-side => 'top');

my $listbox = $lstframe->Listbox(-height => 16,
                                 -width => 16)->pack;
my @listdata = <DATA>;
chomp @listdata;
$listbox->insert( 'end', @listdata );

for (qw/5x8 10x10 16x20/) {
    $btnframe->Button(-text => $_,
                      -command => [ \&resize, $listbox, $_ ],
                      )->pack(-side => 'left');
}

MainLoop;

sub resize
{
    my ( $lbox, $size ) = @_;
    my ( $newh, $neww ) = split( /x/, $size );
    $lbox->packForget;
    $lbox->configure(-height => $newh, -width => $neww );
    $lbox->pack;
}

__DATA__
1234567890123456
ABCDEFGHIJK
1234567890
abcdefghi
12345
stuv
foo
bar
baz
junk
extra lines
last line with no blank following

[download]

That's just a simple proof-of-concept, to show that a callback routine (such as would be invoked by a Button widget) can reconfigure the dimensions of a listbox widget.

So the question would be: what is in your code (or missing from your code) that makes it different from this simple example?

In reply to Re: Tk configure problem by graff
in thread Tk configure problem by Grygonos

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