firePropertyChange(HORIZONTAL_SCROLLBAR_CHANGED_PROPERTY, old, h);
firePropertyChange("horizontalScrollBar", old, h);
  public void setHorizontalScrollBar(JScrollBar h)  {    JScrollBar old = horizontalScrollBar;    removeNonNull(old);    horizontalScrollBar = h;    addNonNull(h);    firePropertyChange(HORIZONTAL_SCROLLBAR_CHANGED_PROPERTY, old, h);    sync();    if (old != null)      {        BoundedRangeModel model = old.getModel();        if (model != null)          model.removeChangeListener(scrollListener);      }    if (h != null)      {        BoundedRangeModel model = h.getModel();        if (model != null)          model.addChangeListener(scrollListener);      }  }