public static void main(String args[]) {
    try {
      QTSession.open();
      GroupDrawing frame = new GroupDrawing("QT in Java");

      frame.pack();
      frame.show();
      frame.toFront();
    } catch (Exception e) {
      e.printStackTrace();
      QTSession.close();
    }
  }
 public void destroy() {
   QTSession.close();
 }