      * 
      *  @return The size of the thumb button. 
      *  The default size is 0.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     protected function calculateThumbSize():Number
     {

     *
     *  @return A value, between <code>minimum</code> and <code>maximum</code>, 
     *  corresponding to <code>position</code>.
     */
    protected function positionToValue(position:Number):Number
    {


    /**
     *  Constructor. 
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    public function FxTrackBase():void
    {
