public function col_deleteentry($row) {
        global $OUTPUT;
        $deleteentryurl = new moodle_url($this->baseurl, ['delete' => $row->id, 'sesskey' => sesskey()]);
        $deleteaction = new confirm_action(get_string('confirmdeleteentry', 'feedback'));
        return $OUTPUT->action_icon($deleteentryurl,
            new pix_icon('t/delete', get_string('delete_entry', 'feedback')), $deleteaction);
    }