// WComponentPeer overrides
  @SuppressWarnings("unchecked")
  protected void disposeImpl() {
    AppContext appContext = SunToolkit.targetToAppContext(target);
    synchronized (appContext) {
      List<WWindowPeer> l = (List<WWindowPeer>) appContext.get(ACTIVE_WINDOWS_KEY);
      if (l != null) {
        l.remove(this);
      }
    }

    // Remove ourself from the Map of DisplayChangeListeners
    GraphicsConfiguration gc = getGraphicsConfiguration();
    ((Win32GraphicsDevice) gc.getDevice()).removeDisplayChangedListener(this);

    synchronized (getStateLock()) {
      TranslucentWindowPainter currentPainter = painter;
      if (currentPainter != null) {
        currentPainter.flush();
        // don't set the current one to null here; reduces the chances of
        // MT issues (like NPEs)
      }
    }

    super.disposeImpl();
  }
  /*
   * The method maps the list of the active windows to the window's AppContext,
   * then the method registers ActiveWindowListener, GuiDisposedListener listeners;
   * it executes the initilialization only once per AppContext.
   */
  @SuppressWarnings("unchecked")
  private static void initActiveWindowsTracking(Window w) {
    AppContext appContext = AppContext.getAppContext();
    synchronized (appContext) {
      List<WWindowPeer> l = (List<WWindowPeer>) appContext.get(ACTIVE_WINDOWS_KEY);
      if (l == null) {
        l = new LinkedList<WWindowPeer>();
        appContext.put(ACTIVE_WINDOWS_KEY, l);
        appContext.addPropertyChangeListener(AppContext.GUI_DISPOSED, guiDisposedListener);

        KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
        kfm.addPropertyChangeListener("activeWindow", activeWindowListener);
      }
    }
  }
 /*
  * Returns all the ever active windows from the current AppContext.
  * The list is sorted by the time of activation, so the latest
  * active window is always at the end.
  */
 @SuppressWarnings("unchecked")
 public static long[] getActiveWindowHandles() {
   AppContext appContext = AppContext.getAppContext();
   synchronized (appContext) {
     List<WWindowPeer> l = (List<WWindowPeer>) appContext.get(ACTIVE_WINDOWS_KEY);
     if (l == null) {
       return null;
     }
     long[] result = new long[l.size()];
     for (int j = 0; j < l.size(); j++) {
       result[j] = l.get(j).getHWnd();
     }
     return result;
   }
 }
 public void propertyChange(PropertyChangeEvent e) {
   Window w = (Window) e.getNewValue();
   if (w == null) {
     return;
   }
   AppContext appContext = SunToolkit.targetToAppContext(w);
   synchronized (appContext) {
     WWindowPeer wp = (WWindowPeer) w.getPeer();
     // add/move wp to the end of the list
     List<WWindowPeer> l = (List<WWindowPeer>) appContext.get(ACTIVE_WINDOWS_KEY);
     if (l != null) {
       l.remove(wp);
       l.add(wp);
     }
   }
 }