public function insertRow($rowData, $key, $wkshtId = 'default')
    {
        $newEntry = new Zend_Gdata_Spreadsheets_ListEntry();
        $newCustomArr = array();
        foreach ($rowData as $k => $v) {
            $newCustom = new Zend_Gdata_Spreadsheets_Extension_Custom();
            $newCustom->setText($v)->setColumnName($k);
            $newEntry->addCustom($newCustom);
        }

        $query = new Zend_Gdata_Spreadsheets_ListQuery();
        $query->setSpreadsheetKey($key);
        $query->setWorksheetId($wkshtId);

        $feed = $this->getListFeed($query);
        $editLink = $feed->getLink('http://schemas.google.com/g/2005#post');

        return $this->insertEntry($newEntry->saveXML(), $editLink->href, 'Zend_Gdata_Spreadsheets_ListEntry');
    }