@Override
  public void showFeedback() {
    FeedbackLayer layer = myContext.getArea().getFeedbackLayer();

    if (myFeedback == null) {
      myFeedback = new AlphaFeedback(myColor);
      layer.add(myFeedback);
      myFeedback.setBounds(myContainer.getBounds(layer));
      layer.repaint();
    }
  }
@Override
  public void showFeedback()