/**
   * Called when a deleted <tt>WhiteboardObject</tt> has been received.
   *
   * @param evt the <tt>WhiteboardObjectDeletedEvent</tt> containing the identification of the
   *     deleted WhiteboardObject, its sender and other details.
   */
  public void whiteboardObjectDeleted(WhiteboardObjectDeletedEvent evt) {
    WhiteboardFrame wbf = getWhiteboardFrame(evt.getSourceWhiteboardSession());

    if (wbf == null) {
      return;
    }

    wbf.setVisible(true);
    String id = evt.getId();
    wbf.receiveDeleteWhiteboardObject(id);
  }