code: public void removeItem (T item)
      {
          if (_model == null) {
              return; // if we have no model, stop here
          }
          // remove the item from our data model
          _model.removeItem(item);
          // force a relayout of this page
          displayPage(_page, true);
      }
docs: Removes the specified item from the panel. If the item is currently being displayed, its
  interface element will be removed as well.