Print Menu
 - Print Invoice
 - Print Bil Of Delivery
 - Print Credit Voucher

public interface IOrderChangeListener {
  void orderStateChanged(OrderState state);
}

public class PrintInvoiceMenu extends AbstractMenu implements IOrderChangeListener {
    @Override
    protected void execInitAction() throws ProcessingException {
        super.execInitAction();
        BEANS.get(OrderManager.class).addListener(this);
    }
    @Override
    public void orderStateChange(OrderState state) {
        setEnabled(state == OrderState.CLOSED);
    }
}

@ApplicationScoped
public class OrderManager {
    List<IOrderChangeListener> listeners = new ArrayList<>();
    public addListener(IOrderCompletionListener listener) {
        listners.add(listener);
    }
    public void orderStateChanged (OrderState state) {
        for(IOrderChangeListener listener: listeneres) {
            listener.orderStateChanged(state);
        }
    }
}

....
    public void loadOrder(....) {
       // code to load order
      BEAN.get(OrderManager.class).orderStateChanged(order.state);
    }

    public void closeOrder(....) {
       // code to close order
      order.state = OrderState.CLOSED;
      BEAN.get(OrderManager.class).orderStateChanged(order.state);
    }
...