Div::start

public function start()
{
	$html = new DivPartHtml($this->buildDivStart());
	$html->setDiv($this);
	$html->setPrefix($this->getPrefix());
	$html->addAssets($this->getAssets());
	if ($this->getKey())
	{
		$html->setKey($this->getKey() . '_start');
	}

	return $html;
}