$counter++;
...
$config{pane}->yview(scroll => $counter, 10);

    *$pane*->see(*$widget* ?,*options*?)
        Adjusts the view so that *$widget* is visable. Aditional parameters
        in *options-value* pairs can be passed, each *option-value* pair
        must be one of the following

        -anchor => *anchor*
                Specifies how to make the widget visable. If not given then
                as much of the widget as possible is made visable.

                Possible values are n, s, w, e, nw, ne, sw and se. This will
                cause an edge on the widget to be aligned with the
                corresponding edge on the pane. for example nw will cause
                the top left of the widget to be placed at the top left of
                the pane. s will cause the bottom of the widget to be placed
                at the bottom of the pane, and as much of the widget as
                possible made visable in the x direction.

$config{pane} = $mw->Scrolled(
    sticky => 'nw'
   -width => 50,
   -height => 50
)->pack();

for (1) {
   $counter++;
   $config{"pane".$counter} = $config{pane}->Label
      -text "Dieser text steht immer unten"
   )->pack;
   $config{pane}->see($config{"pane".$counter}, -anchor => 's');
}