throw new Error("not implemented");
Component focusComp = (comp == null) ? getGlobalFocusOwner () : comp; Container focusCycleRoot = focusComp.getFocusCycleRootAncestor ();  if (focusCycleRoot instanceof Window) { FocusTraversalPolicy policy = focusCycleRoot.getFocusTraversalPolicy (); Component defaultComponent = policy.getDefaultComponent (focusCycleRoot); defaultComponent.requestFocusInWindow ();
  public void upFocusCycle(Component comp)  {    throw new Error("not implemented");  }