[mayakwd]

private var tweensHash : Dictionary = new Dictionary();
 
private function buttonOver (event : Event) : void {
  var button : Button = event.target as Button;
  var tween : TweenMax = tweensHash[button];
  if (tween) {
    tween.kill();
  }
  button.x = 10;
}
 
private function buttonOut (event : Event) : void {
 var button : Button = event.target as Button;
 var tween : TweenMax = TweenMax.to(e.target, 1.5, {x:148});
 tweensHash[button] = tween;
}

как-то так