Æliens

    <mx:Script>
     <![CDATA[
      import mx.core.UIComponent;  // only needed if you use the second method
      import flash.display.Sprite;
      import flash.events.Event;
      import flash.events.MouseEvent;
    
      public var circle:Sprite;
  
  

      
      public function init():void{
       circle = new Sprite();
       circle.graphics.beginFill(0x990000);
       circle.graphics.drawCircle(50, 50, 50);
       circle.graphics.endFill();
      
       this.rawChildren.addChild(circle);  // The quick and dirty method
        
       /* OR YOU CAN DO THIS
       var uic:UIComponent = new UIComponent();
       uic.addChild(circle);
       addChild(uic);
       */
  

        
       circle.addEventListener(MouseEvent.CLICK, startAnimation);
      }
  

      private function fadeCircle(event:Event):void{
          circle.alpha -= .05;
          if (circle.alpha <= 0){
              circle.removeEventListener(Event.ENTER_FRAME, fadeCircle);
          }
      }
  

      
      private function startAnimation(event:MouseEvent):void{
          circle.addEventListener(Event.ENTER_FRAME, fadeCircle);
      }
    
      
     ]]>
    </mx:Script>
  </mx:Application>