Change control label element class

Hi,

anyone has an idea how to add class to label element?

$control->getLabel() returns just a clone, doesn't make much sense to me.

	public function getLabel($caption = NULL)
	{
		$label = clone $this->label;
		$label->for = $this->getHtmlId();
		$label->setText($this->translate($caption === NULL ? $this->caption : $caption));
		return $label;
	}

Thanx for any info :)