Tween problem

1

I am trying to tween a movie clip after a mouse click. It worked fine, but after clicking for a while, the tween function does not appear to start automatically.

Is there anything wrong I am doing here?


public function SelectionClicked(e:MouseEvent):void {
   //Calculate tweenTime and new Y value
   ...

  //This is always printed out after the click
  trace("Clicked");

  //The following don't seem to start automatically and so RunAnotherAnimation never   //runs
   var yTween:Tween =  new Tween(myClip, "y", None.easeNone, myClip.y, newY, tweenTime, true);

   yTween.addEventListener(TweenEvent.MOTION_FINISH, RunAnotherAnimation);
}

public function RunAnotherAnimation(e:TweenEvent)void{
   //This is sometimes not printed out
   trace("Finished");
}
2 
private var yTween:Tween =  new Tween(myClip, "y", None.easeNone, myClip.y, newY, 0, true);
public function constructor() {
   yTween.addEventListener(TweenEvent.MOTION_FINISH, RunAnotherAnimation);
}
public function SelectionClicked(e:MouseEvent):void {
   //Calculate tweenTime and new Y value
   ...

  //This is always printed out after the click
  trace("Clicked");
   yTween.contimueTo(newY,2);
  //The following don't seem to start automatically and so RunAnotherAnimation never   //runs


   }

public function RunAnotherAnimation(e:TweenEvent)void{
   //This is sometimes not printed out
   trace("Finished");
}