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$Output_b->grid( 
        -column => 5,
...
        -rowspan => 6,
        -sticky => 'nsew',
            );

my ($cols, $rows) = $tl->gridSize();

...
for (my $i = 0; $i < $rows; $i++) {
    $tl->gridRowconfigure($i, -weight => 1);
}