<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="library:adobe/flex/halo"
xmlns="http://ns.adobe.com/mxml/2009"
xmlns:ns="library:adobe/flex/gumbo" xmlns:local="*" 
backgroundColor="0xFFFFFF">
<Script>
<![CDATA[
        private var fileReference:FileReference = 
                        new FileReference();
 
        private function onSave():void
        {
   //Instantiate on downloading otherwise you will get an error
   fileReference = new FileReference();
   fileReference.save(myTextArea.text,"myExample.txt");
 
        }
        private function onLoad():void
        {
  //Instantiate on loading
 fileReference = new FileReference();
   //create the filter which will be just uploading the txt
   var myFilter:FileFilter = new FileFilter("Text","*.txt");
   fileReference.browse([myFilter]);
   fileReference.addEventListener(Event.SELECT,onFileSelect);
  fileReference.addEventListener(Event.COMPLETE,onFileComplete);
 
        }
        private function onFileSelect(event:Event):void
        {
              fileReference.load();
        }
        private function onFileComplete(event:Event):void
        { 
 
      myTextArea.text = 
    fileReference.data.readUTFBytes(fileReference.data.length);
 
        }
]]>    	
</Script>
 
   <mx:Panel id="myPanel" width="500" height="500">
    <ns:TextArea width="450" height="450" id="myTextArea"/>
   <mx:ControlBar>
   	<mx:Button label="Save" click="onSave()"/>
   	<mx:Button label="Load" click="onLoad()"/>
   </mx:ControlBar>
   </mx:Panel>
</mx:Application>