protected function selectmultiple_button(structure $structure) {
        $buttonoptions = array(
            'type'  => 'button',
            'name'  => 'selectmultiple',
            'id'    => 'selectmultiplecommand',
            'value' => get_string('selectmultipleitems', 'quiz'),
            'class' => 'btn btn-secondary mb-1'
        );
        if (!$structure->can_be_edited()) {
            $buttonoptions['disabled'] = 'disabled';
        }

        return html_writer::tag('button', get_string('selectmultipleitems', 'quiz'), $buttonoptions);
    }