$beschriftung = "Zeile1\nZeile2";
$button1 = $mw->Button( -text => $beschriftung,
                        -relief => "raised",
               
         -font => "{Arial} 24 {bold}",
               
         -background => "#FFFF00",
               
         -activebackground => "#FFFF00",
                        -command => sub { }
                         )->place( -x => 55, -y => 50, -height => 100, -width => 200);