想画个曲线图，可是老是direction属性无法解析。求教解决办法

想画个曲线图，可是老是direction属性无法解析。求教
改别的属性也不行。删除可以。。
<?xml version="1.0"?>
<!-- Simple example to demonstrate the GridLines class. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

  <mx:Script>
  <![CDATA[

  import mx.collections.ArrayCollection;

  [Bindable]
  private var expensesAC:ArrayCollection = new ArrayCollection( [
  { Month: "Jan", Profit: 2000, Expenses: 1500, Amount: 450 },
  { Month: "Feb", Profit: 1000, Expenses: 200, Amount: 600 },
  { Month: "Mar", Profit: 1500, Expenses: 500, Amount: 300 },
  { Month: "Apr", Profit: 1800, Expenses: 1200, Amount: 900 },
  { Month: "May", Profit: 2400, Expenses: 575, Amount: 500 } ]);
  ]]>
  </mx:Script>

  <mx:Panel title="GridLines Example" height="100%" width="100%">

  <mx:LineChart id="linechart" height="100%" width="100%"
  paddingLeft="5" paddingRight="5" 
  showDataTips="true" dataProvider="{expensesAC}">
   
  <mx:horizontalAxis>
  <mx:CategoryAxis categoryField="Month"/>
  </mx:horizontalAxis>
   
  <mx:backgroundElements>
  <mx:GridLines direction="horizontal">
  <mx:horizontalStroke>
  <mx:Stroke weight="1"/>
  </mx:horizontalStroke>
  <mx:horizontalFill>
  <mx:SolidColor color="0xCCCCCC" alpha=".66"/>
  </mx:horizontalFill>
  </mx:GridLines>
  </mx:backgroundElements>

  <mx:series>
  <mx:LineSeries yField="Profit" form="curve" displayName="Profit"/>
  <mx:LineSeries yField="Expenses" form="curve" displayName="Expenses"/>
  <mx:LineSeries yField="Amount" form="curve" displayName="Amount"/>
  </mx:series>
  </mx:LineChart>

  <mx:Legend dataProvider="{linechart}"/>

  </mx:Panel>
</mx:Application>


无法为组件类型“mx.charts.GridLines”解析属性“direction”。 myFlex.mxml /myFlex/src line 31

------解决方案--------------------
GridLines 没有这个属性direction 当然无法解析了
------解决方案--------------------
楼主sdk是哪个版本的？可能是版本问题，我这把代码铐过来是没有问题的。

我的是3.2