protected final Listitem newUnloadedItem(ListitemRenderer renderer, int index) {
final ListModel model = _listbox.getModel();
Listitem item = null;
if (model instanceof GroupsListModel) {
final GroupsListModel gmodel = (GroupsListModel) model;
final GroupDataInfo info = gmodel.getDataInfo(index);
switch(info.type){
case GroupDataInfo.GROUP:
item = newListgroup(renderer);
((Listgroup)item).setOpen(!info.close);
break;