public function do_cmb_form()
{
if (!function_exists('cmb2_metabox_form')) {
return;
}
$form = '<form class="cmb-form" method="post" id="%1$s" enctype="multipart/form-data" encoding="multipart/form-data"><input type="hidden" name="object_id" value="%2$s">%3$s</form>';
cmb2_metabox_form($this->get_cmb_object(), $this->button_slug, array('form_format' => $form));
}