private void addColumnListener(TableColumn column, final Comparator comparator) {
private void addColumnListener(TableColumn column, final TrackComparator comparator) {
  private void addColumnListener(TableColumn column, final Comparator comparator) {    //final Integer colNo = new Integer(columnNumber);    column.addListener(SWT.Selection, new Listener() {      public void handleEvent(Event e) {          TrackTable.this.comparator = (TrackComparator)comparator;          updateTable();      }     });  }