      *  The number of items in this list.  
      * 
      *  @return -1 if the length is unknown while 0 means no items
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion Flex 3
      */
     public function get length():int
     {

     *  @param index the index at which to place the item
     *  @return the item that was replaced, null if none
     *  @throws RangeError if index is less than 0     
     */
    public function setItemAt(item:Object, index:int):Object
    {    

	
	/**
	 *  clears busy flag
	 *  
	 *  @langversion 3.0
	 *  @playerversion Flash 9
	 *  @playerversion AIR 1.1
	 *  @productversion Flex 3
	 */
	private function clearBusy():void
	{
