         target.filters = [shaderFilter];
     }
 
+    /**
+     * @private
+     */
     override public function animationStart(animation:Animation):void
     {
         super.animationStart(animation);

        // shader filter during the animation.
        oldFilters  = target.filters;
    }    
    override public function animationEnd(animation:Animation):void
    {
        target.filters = oldFilters;

    public var bitmapTo:BitmapData;

    /**
     *  @copy spark.effects.AnimateShaderTransition#shaderCode
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
