dirtyComponentsWork = new HashMap();
  public RepaintManager()  {    dirtyComponents = new HashMap();    invalidComponents = new ArrayList();    repaintWorker = new RepaintWorker();    doubleBufferMaximumSize = new Dimension(2000,2000);    doubleBufferingEnabled = true;    offscreenBuffers = new WeakHashMap();    repaintUnderway = false;    commitRequests = new HashMap();  }