как реализовать "прогрес бар" копирования файлов ?

[teda]

странные дела ,
пре использование "copyToAsync" рекурсивная функция начинает глючит.

	<fx:Script>
		<![CDATA[
			private var browseSourceFolder:File = new File();
			private	var target:File =new File("c:/teda");
			private var counter:Number  =0;
			private var isCount:Boolean=true;
 
			protected function button1_clickHandler(event:MouseEvent):void
			{
				target.createDirectory();
				browseSourceFolder.addEventListener(Event.SELECT,sourceFolderHendler)
				browseSourceFolder.browseForDirectory("Select source folder");
			}
			private function sourceFolderHendler(e:Event):void
			{
				browseSourceFolder = e.target as File;
				rekysia( e.target as File)
			}
			private function rekysia(file:File):void
			{
				var tempFolder:File = target.parent;
				var files:Array = file.getDirectoryListing();
				for each(var f:File in file.getDirectoryListing())
				{
					if(f.isDirectory)
					{	
						tempFolder =new File(target.nativePath+"/"+f.name);
						tempFolder.createDirectory();
						rekysia(f);
					}
					else
					{
						counter++
							_lb.text=file.name;
						file.copyToAsync((target,true);
 
					}
				}
			}
		]]>
	</fx:Script>