public function addPage($id = "", $header = "", $meta = array())
    {
        $objPage = new Page($id, $header, $meta);
        $this->__elements->addObject($objPage);

        if ($this->__elements->count() == 1) {
            // Add unique id field.
            $this->addHiddenField("vf__uniqueid", ValidForm::VFORM_STRING, array(
                "default" => $this->getUniqueId()
            ));
        }

        $this->__pagecount ++;

        return $objPage;
    }