return false;
return focusTraversalKeys != null && focusTraversalKeys[id] != null;
  public boolean areFocusTraversalKeysSet(int id)  {    if (id != KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS &&        id != KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS &&        id != KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS &&        id != KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS)      throw new IllegalArgumentException ();    return false;  }