flex中图表的Y轴怎么设置在右边

flex中图表的Y轴如何设置在右边
|
  |
  |y轴
  |
  |
____________________|
  x轴
如何把y轴放到右边去？
图中的定时器效果不变。

具体的flex代码如下：
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()">

  <mx:Script>
  <![CDATA[
  import mx.charts.chartClasses.AxisLabelSet;
  import mx.formatters.DateFormatter;
  import mx.charts.chartClasses.IAxis;
  import mx.collections.ArrayCollection;

  [Bindable] 
  public var testDatas:ArrayCollection;
   
  [Bindable]
  private var maxDate:Date;
  [Bindable]
  private var minDate:Date;
   
  private var timer:Timer;
  private var dateFormat:DateFormatter = new DateFormatter();
  private var dateVar:Date;

  private function init():void {
   
  dateFormat.formatString = "HH:NN:SS";  
  minDate = new Date();
  var dx:Date = new Date();
  dx.setMinutes(dx.getMinutes()+1, dx.getSeconds(), dx.getMilliseconds());
  maxDate = dx;
   
  dateVar = new Date();
  testDatas = new ArrayCollection([{date: dateVar, valueTest: 101.71} ]);
   
  timer = new Timer(1000);
  timer.addEventListener(TimerEvent.TIMER, getDatas)
  timer.start();
   
  }
   
  private function mylabel(labelValue:Object, previousValue:Object, d:IAxis):String {
  var str:String = dateFormat.format(labelValue);
  return str;
  }
   
  private function getDatas(et:Event):void {
  var valueTestValue:int = Math.random()*50;
  var dm:Date = new Date();
  dm.setTime(dateVar.getTime());
  dm.setSeconds(dm.getSeconds()+1, dm.getMilliseconds());
  dateVar = dm;
   
  if (dateVar.getTime()>maxDate.getTime()) {
  maxDate = dateVar;
  var dx:Date = new Date();
  dx.setMinutes(dx.getMinutes()-1, dx.getSeconds(), dx.getMilliseconds());
  minDate = dx;
  }
  testDatas.addItem({date: dateVar, valueTest: valueTestValue});  
   
  }
   
  ]]>
  </mx:Script>

  <mx:Panel title="DateTimeAxis Example" height="100%" width="100%">
  <mx:LineChart id="mychart" height="100%" width="100%" 
  paddingRight="5" paddingLeft="5"
  showDataTips="true" >
   
  <mx:horizontalAxis>
  <mx:DateTimeAxis dataUnits="seconds" interval="5" minimum="{minDate}" maximum="{maxDate}" labelFunction="mylabel" />