      *  @eventType thumbDrag
      *  
      *  @langversion 3.0
-     *  @playerversion Flash 9
-     *  @playerversion AIR 1.1
-     *  @productversion Flex 3
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */
     public static const THUMB_DRAG:String = "thumbDrag";
 

     *  @eventType thumbRelease
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    public static const THUMB_RELEASE:String = "thumbRelease";

	//--------------------------------------------------------------------------
	//
	//  Constructor
	//
	//--------------------------------------------------------------------------

	/**
	 *  Constructor.
	 *
	 *  @param type The event type; indicates the action that caused the event.
	 *
	 *  @param bubbles Specifies whether the event can bubble up the display list hierarchy.
	 *
	 *  @param cancelable Specifies whether the behavior associated with the event can be prevented.
	 *  
	 *  @langversion 3.0
	 *  @playerversion Flash 10
	 *  @playerversion AIR 1.5
	 *  @productversion Flex 4
	 */
	public function TrackBaseEvent(
								type:String, bubbles:Boolean = false,
								cancelable:Boolean = false)
	{
		super(type, bubbles, cancelable);
	}

	//--------------------------------------------------------------------------
	//
	//  Overridden methods: Event
	//
	//--------------------------------------------------------------------------

	/**
	 *  @private
	 */
    override public function clone():Event
    {
        return new TrackBaseEvent(type, bubbles, cancelable);

{
    include "../core/Version.as";

    //--------------------------------------------------------------------------
    //
    //  Class constants
    //
    //--------------------------------------------------------------------------

    /**
     *  The <code>TrackBaseEvent.THUMB_DRAG</code> constant defines the value of the 
     *  <code>type</code> property of the event object for a <code>thumbDrag</code> event. 
     *
