fireSelectionValueChanged(lo, hi, valueIsAdjusting);
fireValueChanged(lo, hi, valueIsAdjusting);
  public void removeSelectionInterval(int index0,                                      int index1)  {    int lo = Math.min(index0, index1);    int hi = Math.max(index0, index1);    sel.clear(lo, hi+1);     fireSelectionValueChanged(lo, hi, valueIsAdjusting);  }