Preset::uninstall

public function uninstall($xmlId = null)
{
	$filter = array('=IS_SYSTEM' => 'Y');
	if($xmlId)
	{
		$filter['=XML_ID'] = $xmlId;
	}
	$formDb = Internals\ButtonTable::getList(array(
		'select' => array('ID'),
		'filter' => $filter,
	));
	while($form = $formDb->fetch())
	{
		$deleteDb = Internals\ButtonTable::delete($form['ID']);
		if(!$deleteDb->isSuccess())
		{
			$this->errors = array_merge($this->errors, $deleteDb->getErrorMessages());
		}
	}

	if(!$xmlId)
	{
		self::updateInstalledVersion(0);
	}
}