How to implement the design await onComplete

[Василий Корягин]

Hi, I'm sorry for the possibly stupid question.

I have it now

hide(){
  Tween tweenPic = juggler.addTween(this, 3, Transition.linear);
  tweenPic.animate.y.to(heightScreen-middlePanel.height);
  tweenPic.onComplete = (){
    this.removeFromParent();
  };
}

I want something like that(That the procedure would be completed after 3 seconds along with the completion of the animation)

hide() async{
  Tween tweenPic = juggler.addTween(this, 3, Transition.linear);
  tweenPic.animate.y.to(heightScreen-middlePanel.height);
  await (tweenPic.onComplete = (){
    this.removeFromParent();
  });
}

But the desired design does not work, can this be made workable, thanks.