protected function _prepareMassaction() { parent::_prepareMassaction(); if (Mage::helper('pdfinvoiceplus')->checkEnable()) { $this->getMassactionBlock()->addItem('pdfcreditmemogrid', array('label' => $this->__('Print Credit Memos via PDF Invoice+'), 'url' => $this->getUrl('pdfinvoiceplusadmin/adminhtml_creditmemo/printmasscreditmemogrid'))); } }