@Override
      public void valueChanged(ListSelectionEvent e) {
        QuickList item = editor.getSelected();
        if (item == null) {
          cardLayout.show(itemPanelWrapper, EMPTY);
          itemPanel.setItem(null);
        }
        else {
          cardLayout.show(itemPanelWrapper, PANEL);
          itemPanel.setItem(editor.getMutable(item));
        }
      }
@Override
      public void valueChanged(ListSelectionEvent e)