function addSpacer($height = 1, $spacing = 5)
{
$s = $this->createRow();
$s->setHeight($spacing);
$l = new Line();
$l->setHeight($height);
$s->setAttribute(0, $l);
$s->setSpawnAll(true);
$this->addRow($s);
// damit changeColor passt
$spcR = $this->createRow();
$spcR->setHeight(0);
$this->addRow($spcR);
}