Hi, no problem. When I first tried setting this up myself, there was a question of whether to use Scrolled Canvases, or make separate plain canvases and scrollbars, and link them manually. Then I hit the scrollbar alignment problem, as you are experiencing on Windows, when trying the manual linking approach. On linux, they aligned with Scrolled-Canvases, so I went with that. But here is my original manual attempt, which may help you. It has other glitches on linux, like when you scroll to the extreme ends of the scrollbar regions, it loses linearity. But it may work better on Windows.

For what it's worth, I originally was trying to copy the Table functionality of Gtk2, to align everything, see Gtk2 linked scrolled Canvases in table for a Gtk2 version of this using Tables. Tables are the way to go, and if you can switch to Perl/Gtk2 you may be better off. CamelBox installs and works well for me on my Vista Basic testbox, but I normally don't use Windows at all.

So here is an alternate Tk method. I spent all afternoon trying this stuff out, so I don't care to try and jump in to fix the Linux/Win32 incompatibilities....but you may be luckier. Like I said, if you want easy Linux/Win32 compatibility, go with the Tables of Gtk2.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $mw =  new MainWindow();
$mw->geometry("600x400+200+200");

#for xscroll, must be packed before midframe to be visible
my $botframe  = $mw->Frame(-bg=>'grey45')
                   ->pack(-fill=>'x',-side=>'bottom');

my $midframe = $mw->Frame(-bg=>'grey45')->pack();
my $midframel = $midframe->Frame(-bg=>'grey45')
                   ->pack(-side=>'left',-expand=>1,-fill=>'y');
my $midframer = $midframe->Frame(-bg=>'grey45')
                   ->pack(-side=>'right');

my $num_channels = 40;

my $canvasp;

my $canvast = $midframer->Canvas(
             -bg =>'pale goldenrod',
             -width=>2400,
             -height=>25,
         #need to set scrollregion with a bit extra to ensure
         #endpoint accuracy. See xscrollit sub
         -scrollregion=>[-10,0,7250,25],
         -xscrollincrement => 1,
         )->pack(-side=>'top');

#for canvasp and yscroll
my $midframer1 = $midframer->Frame(-bg=>'grey45')
                   ->pack(-side=>'top');

my $yscroll = $midframer1->Scrollbar( 
       -orient  => 'vertical',
       -command => \&yscrollit,
       -troughcolor =>'grey45',
       -activebackground =>'lightseagreen',
       -background => 'lightseagreen',
       )->pack(-side=>'right',-fill=>'y');

my $canvasxsd = $botframe->Canvas(  #dummy filler
             -bg =>'grey45',
             -width=>75,
             -height=>25,
         -borderwidth=>0,
         ) ->pack(-side=>'left');

my $xscroll = $botframe->Scrollbar(
       -orient  => 'horizontal', 
       -command => \&xscrollit ,
       -troughcolor =>'grey45',
       -activebackground =>'lightseagreen',
       -background => 'lightseagreen',
       )->pack(-side=>'right', -fill=>'x',-expand =>1);


$canvasp = $midframer1->Canvas(
             -bg =>'lightsteelblue',
             -width=>2400,
             -height=> 50 * $num_channels,
             -scrollregion=>[-10,0,7250,(33 * $num_channels)],
         -xscrollincrement => 1,
         -yscrollincrement => 1,
         -xscrollcommand => [ 'set', $xscroll ],
             -yscrollcommand => [ 'set', $yscroll ],
         ) ->pack(-side=>'left');#,-fill=>'both');


my $canvasd = $midframel->Canvas( #top of left frame dummy filler
             -bg =>'grey45',
             -width=>75,
             -height=>25,
         -borderwidth =>0,
         )->pack(-side=>'top');

my $canvass = $midframel->Canvas(  #left frame canvas
             -bg =>'lightseagreen',
             -width=>75,
             -height=> 50 * $num_channels,
             -scrollregion=>[0,0,75,(33 * $num_channels)],
         -yscrollincrement => 1,
         ) ->pack(-side=>'top');

#fill in some sample data to see scrolling action
for( 0 .. 33 * $num_channels){
    $canvass->createText(38, 10 + $_ * 33,
              -text => "C $_" ,
           );
  }

#set up top frame canvas... a timeline
for(0..7200){
   
      if( $_ % 50 == 0){
         $canvast->createLine($_,0,$_,12,-width=> 4,-tags=>['tick'] );
         $canvast->createText($_, 20, -text=> $_,-tags=>['tick'] );
     }      
}


#set up main frame some canvas data
foreach my $y (0..39){
   foreach my $x (0..7200){
          next unless ( $x % 5 == 0);
          next if 20*$x > 7200;
         $canvasp->createText($x * 20,  8 + $y * 33, 
                          -text=> 20*$x.'-'.$y,
                           -tags=>['data'] );
   }
}

MainLoop;
###################################
sub xscrollit{
 my $fraction = $_[1];
 $canvast->xviewMoveto($fraction);
 $canvasp->xviewMoveto($fraction);
}
#################
sub yscrollit{
  my $fraction = $_[1];
  $canvass->yviewMoveto($fraction);
  $canvasp->yviewMoveto($fraction);

}
##############
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