protected function stealth_section_header($sectionno) {
        $o = '';
        $o.= html_writer::start_tag('li', array('id' => 'section-'.$sectionno, 'class' => 'section main clearfix orphaned hidden'));
        $o.= html_writer::tag('div', '', array('class' => 'left side'));
        $course = course_get_format($this->page->course)->get_course();
        $section = course_get_format($this->page->course)->get_section($sectionno);
        $rightcontent = $this->section_right_content($section, $course, false);
        $o.= html_writer::tag('div', $rightcontent, array('class' => 'right side'));
        $o.= html_writer::start_tag('div', array('class' => 'content'));
        $o.= $this->output->heading(get_string('orphanedactivitiesinsectionno', '', $sectionno), 3, 'sectionname');
        return $o;
    }