scroller.getViewport().setView(list); scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scroller.setFocusable(false); scroller.getVerticalScrollBar().setFocusable(false);
  protected void configureScroller()  {    scroller.setBorder(null);    scroller.getViewport().setView(list);    scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);  }