@Override
  public boolean closeActivePopup() {
    if (myStack.isEmpty()) return false;

    final AbstractPopup popup = (AbstractPopup)myStack.peek();
    if (popup != null && popup.isVisible() && popup.isCancelOnWindowDeactivation() && popup.canClose()) {
      popup.cancel();
      // setCancelCallback(..) can override cancel()
      return !popup.isVisible();
    }
    return false;
  }
@Override
  public boolean closeActivePopup()