Hi, here is something quick that does it. A combination of stretchmode settings and min size height for the window seems to do it. You can play around with other stretchmode settings, and setting the min height you want.

#!/usr/bin/perl
use Tk;
use Tk::TableMatrix;

my $mw = MainWindow->new;
$mw->minsize(600, 125); # height, width 

my $arrayVar = {};

print "Filling Array...\n";
my ($rows,$cols) = (10, 10);
 foreach my $row  (0..($rows-1)){
    foreach my $col (0..($cols-1)){
      $arrayVar->{"$row,$col"} = 2*$row + 3*$col;
   }
}

print "Creating Table...\n";

## Test out the use of a callback to define tags on rows and columns
sub colSub{
  my $col = shift;
  return "OddCol" if( $col > 0 && $col%2) ;
}

my $t = $mw->Scrolled('TableMatrix', -rows => $rows, -cols => $cols,
-width => 10, -height => 10,
-titlerows => 1, -titlecols => 1,
-variable => $arrayVar,
-coltagcommand => \&colSub,
-browsecommand => \&brscmd,
-colstretchmode => 'all',
-rowstretchmode => 'all',
-selectmode => 'extended',
-selecttitles => 0,
-drawmode => 'slow',
-scrollbars=>'se'
);

#----------------------------------
#HERE IS WHERE I TRY TO USE BUTTONS
#----------------------------------
my $buttonTest = $mw->Button(-text => "test")->pack(-expand=>1,-fill=>
+'both');
#$t->set("3,3",-window=> $buttonTest);
#print $t->configure(window,"3,3"),"\n";

$t->windowConfigure("3,3", -window => $buttonTest);
#my $textcontainer = $t->createWindow(#
#    3,3  # default anchor is center
#   -window => $buttonTest,
#  );


#----------------------------------

$mw->Button(-text => "Update", -command => \&update_table)
               ->pack(-side => 'bottom',-anchor => 'w');

$mw->Button(-text => "Disable", -command => \&dis_table)
               ->pack(-side => 'bottom',-anchor => 'w');

# hideous Color definitions here:
$t->tagConfigure('active', -bg => 'white', -relief => 'sunken');
$t->tagConfigure('OddCol', -bg => 'lightyellow', -fg => 'black');
$t->tagConfigure('title', -bg => 'lightblue', -fg => 'black', -relief 
+=> 'sunken');
$t->tagConfigure('dis', -state => 'disabled', -bg => 'black');
$t->pack(-expand => 1, -fill => 'both');
$t->focus;

Tk::MainLoop;

sub update_table {

        print "1\n";
        $t->tagCell('dis', '1,1' );
       $t->tagRaise('dis', 'OddCol');  
       # only needed if coltagcommand used
        $t->activate('2,2');
        $t->tagRow('active',3);
        
#       $t->configure(-padx =>( $t->cget(-padx)));
#       a trick needed sometimes to update                

}


sub brscmd {
my ($previous_index, $actual_index) = @_;
my ($row, $col) = split ',', $actual_index;
print "r$row c$col\n";
}

sub dis_table{
   print "2\n";

    foreach my $col (1..4){
     if ($arrayVar->{"6,$col"} >= 1) {
           print "col->$col\n";
           $t->tagCell('dis',"7,$col");
           $t->tagCell('dis',"8,$col");
           $t->tagCell('dis',"9,$col");
    }
  }
   $t->tagRaise('dis', 'OddCol');  # only needed if coltagcommand used
}
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