Transition transition = new Transition( this, destination, guard, description );  addTransition( transition );  return transition;
this.transitions.add( transition );
    public Transition addTransition(Node destination,                                    Guard guard,                                    String description)    {        Transition transition = new Transition( this,                                                destination,                                                guard,                                                description );                addTransition( transition );                return transition;               }