$form = new Form($form_ID, $layout = 'horizontal', $attr = '', $framework = 'bs3');
$form->addCountrySelect($select_name, $label = '', $attr = '', $user_options = array());
$form->printCheckboxGroup($group_name, $label = '', $inline = true, $attr = '');
$form->addPlugin($plugin_name, $selector, $js_content = 'default', $js_replacements = '');
$form->addFileUpload($type, $name, $value = '', $label = '', $attr = '', $fileUpload_config = '', $current_file = '');