public function management_form_start() {
        $form = array('action' => $this->page->url->out(), 'method' => 'POST', 'id' => 'coursecat-management');

        $html = html_writer::start_tag('form', $form);
        $html .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey', 'value' => sesskey()));
        $html .=  html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'action', 'value' => 'bulkaction'));
        return $html;
    }