      *  <p>This operation is not supported in FxScroller.  FxScroller only 
      *  has one child.  Use the <code>viewport</code> property to manipulate 
      *  it.</p>
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     public function swapElements(element1:IVisualElement, element2:IVisualElement):void
     {

     *  <p>This operation is not supported in FxScroller.  FxScroller only 
     *  has one child.  Use the <code>viewport</code> property to manipulate 
     *  it.</p>
     */
    public function addElement(element:IVisualElement):IVisualElement
    {

     *  This property is Bindable.
     * 
     *  @default null
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    public function get viewport():IViewport
    {       
