code: public void appendItem (T item)
      {
          // if we're on the last page and there are fewer than a full page of items, this new item
          // will show up on this page so add it
          if (_pageItems.size() < _pageCount) {
              _pageItems.add(item);
          }
          _count++;
      }
docs: Appends an item to an already loaded model. The model must have at least been asked to
  display its first page (and hence have it's total count).