String itemValueStr = StringUtils.defaultString(itemValue == null ? null : itemValue.toString());
boolean selected = ContainUtil.contains(value, itemKey);
writeOption(itemKeyStr, itemValueStr, selected);
stack.pop();
}
}
//opt group
List<ListUIBean> listUIBeans = (List<ListUIBean>) params.get(OptGroup.INTERNAL_LIST_UI_BEAN_LIST_PARAMETER_KEY);