You can divide the screen in two, then divide each half in two (needs 3 adjusters).

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2 ---  | --- 3
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       1
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Here is a code snippet that demonstrates multiple Adjusters:

#!perl -w
use strict;

use Tk 800.005;
use Tk::TList;
use Tk::DirTree;
use Tk::Frame;
use Tk::Scrollbar;
use Tk::Adjuster;

use vars qw/%tk/;

$tk{mw} = MainWindow->new(-background => 'white');

$tk{mw}->geometry('500x400');

$tk{top_frame}   = $tk{mw}->Frame;
$tk{left_frame}  = $tk{mw}->Frame;

#
# The first adjuster separates the left from the right
# and since we want to control the left_frame size, we
# assign the left_frame as the -widget.
#
$tk{adjuster}    = $tk{mw}->
    Adjuster(-widget=> $tk{left_frame}, -side=>'left');


$tk{right_frame} = $tk{mw}->Frame;

$tk{dir_tree}    = $tk{left_frame}->Scrolled('DirTree',
                         -height=>'0',
                         -width=>'0',
                         -scrollbars=>'e', );

$tk{output_list} = $tk{right_frame}->Scrolled('TList',
                          -height=>'1',
                          -width=>'1',
                          -scrollbars=>'osoe',);

#
# Create an adjuster that controls the right frame's top
# widget, the output_list.  The -side attribute specifies
# which side the widget is on.
#
$tk{output_adjuster}    = 
    $tk{right_frame}->
        Adjuster(-widget=> $tk{output_list}, -side=>'top');


$tk{user_list} = $tk{right_frame}->Scrolled('TList',
                        -height=>'1',
                        -width=>'1',
                        -scrollbars=>'osoe',);

#
# Create an adjuster that controls the right frame's 
# use_list widget.
#
$tk{user_adjuster}    = 
    $tk{right_frame}->
        Adjuster(-widget=> $tk{user_list}, -side=>'top');


$tk{group_list} = $tk{right_frame}->Scrolled('TList',
                         -height=>'1',
                         -width=>'1',
                         -scrollbars=>'osoe',);
                         
$tk{dir_tree}->chdir( "." );

$tk{top_frame}->pack(qw/-side top -fill x/);
$tk{left_frame}->pack(qw/-side left -fill y/);


#
# Use the normal pack for the first Adjuster
#
$tk{adjuster}->pack(qw/-side left -fill y/);
$tk{right_frame}->pack(qw/-side right -fill both -expand 1/);

$tk{dir_tree}    ->pack(qw/-side left -fill both -expand 1/);
$tk{output_list} ->pack(qw/-side top -fill both -expand 1/);
$tk{user_list}   ->pack(qw/-side top -fill both -expand 1/);
$tk{group_list}  ->pack(qw/-side top -fill both -expand 1/);

#
# Use packAfter here (see the Tk::Adjuster docs 
# for explanation)
#
$tk{user_adjuster}->
    packAfter($tk{user_list},qw/-side top -fill y/);
$tk{output_adjuster}->
    packAfter($tk{output_list},qw/-side top -fill y/);


MainLoop;
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If you are using the pack layout manager, you have to watch out for the order in which you pack the widgets or else you may get funny results.

--
hiseldl
"Act better than you feel"