save xml with flash.net.FileReference

gistfile1.as

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:s="library://ns.adobe.com/flex/spark"
			   xmlns:mx="library://ns.adobe.com/flex/mx"
			   width="320" height="480" 
			   applicationComplete="mdm.Application.init(this);" 
			   creationComplete="Controller.instance.model.existingDataObj.existingDataXML = xml;">
	
	<fx:Declarations>
		<fx:XML format="e4x" id="xml" xmlns="">
			<root label="Menu">
				<menuitem label="MenuItem A">
					<menuitem label="SubMenuItem 1-A"/>
					<menuitem label="SubMenuItem 2-A" />
				</menuitem>
				<menuitem label="MenuItem B"/>
				<menuitem label="MenuItem C" type="check"/>
				<menuitem type="separator"/>
				<menuitem label="MenuItem D">
					<menuitem label="SubMenuItem 1-D" type="radio" groupName="one"/>
					<menuitem label="SubMenuItem 2-D" type="radio" groupName="one"/>
					<menuitem label="SubMenuItem 3-D" type="radio" groupName="one"/>
				</menuitem>
			</root>
		</fx:XML>
	</fx:Declarations>
	
	<fx:Script>
		<![CDATA[
			import mdm.Application;
			//
			//
			private var Controller:Object = {
				instance: {
					model: {
						existingDataObj: {}
					}
				}
			};
			//
			[Bindable]
			private var txt:String = "";
			private function debug(msg:*):void
			{
				trace(msg);
				txt += msg.toString()+"\n";
			};
			//
			private var fr:flash.net.FileReference = null;
			protected function saveXMLHandler(event:MouseEvent):void
			{
				fr = new FileReference();
				var objXML:XML = Controller.instance.model.existingDataObj.existingDataXML;
				fr.addEventListener(Event.CANCEL, saveCancelHandler);
				fr.addEventListener(Event.COMPLETE, saveCompleteHandler);
				try
				{
					fr.save(objXML, "data.xml");
				} catch(error:Error)
				{
					debug("ERROR!!: "+error.name+" "+error.errorID+" "+error.message);
				}
				
			};
			//
			protected function saveCancelHandler(event:Event):void
			{
				debug(event.type);
			};
			protected function saveCompleteHandler(event:Event):void
			{
				debug(event.type);
				debug("creationDate: "+fr.creationDate);
				debug("size: "+fr.size);
			};
			//
			private function cleanup():void
			{
				fr.removeEventListener(Event.CANCEL, saveCancelHandler);
				fr.removeEventListener(Event.COMPLETE, saveCompleteHandler);
				fr = null;
			}
		]]>
	</fx:Script>

	<s:Button x="10" y="10" width="300" label="Save XML" click="saveXMLHandler(event)"/>
	<s:Label x="10" y="39" width="300" height="431" text="{txt}"/>
</s:Application>