protected function doHeaderRow($contentNode)
 {
     parent::doHeaderRow($contentNode);
     $head = $this->template->appendFileByName("customReports_table_head_cell.html", "th", "report_header", 0, $contentNode, true);
     if (!$head instanceof DOMNode) {
         I2CE::raiseError("Could not add head cell to table");
         return false;
     }
     $text = $this->template->createTextNode($this->page->getActionHeader());
     $this->template->appendNode($text, $head);
 }