public function addFieldset($header = null, $noteHeader = null, $noteBody = null, $meta = array())
    {
        $objFieldSet = new Fieldset($header, $noteHeader, $noteBody, $meta);

        $objPage = $this->__elements->getLast("ValidFormBuilder\\Page");
        if (! is_object($objPage)) {
            $objPage = $this->addPage();
        }

        $objPage->addField($objFieldSet);

        return $objFieldSet;
    }