public function addVideoClicksCustomClick($url)
    {
        // create CustomClick
        $customClickDomElement = $this->getDomElement()->ownerDocument->createElement('CustomClick');
        $this->getVideoClicksDomElement()->appendChild($customClickDomElement);

        // create cdata
        $cdata = $this->getDomElement()->ownerDocument->createCDATASection($url);
        $customClickDomElement->appendChild($cdata);

        return $this;
    }