flex 动态生成多线条 显示数据点的有关问题

flex 动态生成多线条 显示数据点的问题
flex 动态生成几条线的图形，现在我使用了dataTipFunction，鼠标移到数据点的数据描述出来，我想要数据点的Y轴值前面有线条的displayname一样
   
  现在三根线都是一样的名字 要不一样的 对应线的名字

  不明白之处 请运行下面代码看下

在线等待支援 .................................

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
xmlns:actionscript="com.travelsky.pss.fligt.descision.actionscript.*" 

layout="absolute" borderThickness="1" creationComplete="creatinit()">
<mx:Style>
@font-face {  
src: local("Arial");  
font-family: EmbeddedArial;  
}
LineChart{
fontFamily:EmbeddedArial; 

} 
.ChineseFont  
{  
fontFamily:"Verdana","宋体";  
fontSize:14;  
}  

</mx:Style>
<mx:Script>
<![CDATA[
import flash.utils.getDefinitionByName;

import mx.charts.HitData;
import mx.charts.renderers.CircleItemRenderer;
import mx.charts.series.LineSeries;
import mx.charts.series.items.LineSeriesItem;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.events.CloseEvent;
private var xmllist:XML =<node>
<linedata name='国航'>
<nodedata yfields="87" xfields="08:10:47"/><nodedata yfields="46" xfields="08:25:48"/>
<nodedata yfields="7" xfields="08:40:49"/><nodedata yfields="42" xfields="08:55:49"/>
<nodedata yfields="81" xfields="09:10:50"/><nodedata yfields="21" xfields="09:25:51"/>
<nodedata yfields="71" xfields="09:40:52"/><nodedata yfields="9" xfields="09:55:52"/>
<nodedata yfields="30" xfields="10:10:53"/><nodedata yfields="68" xfields="10:25:54"/>
<nodedata yfields="61" xfields="10:40:54"/><nodedata yfields="63" xfields="10:55:55"/>
<nodedata yxfields="61" xfields="11:10:56"/><nodedata yfields="3" xfields="11:25:57"/>
<nodedata yfields="87" xfields="11:40:58"/><nodedata yfields="83" xfields="11:55:59"/>
</linedata>
<linedata name='东航'>
<nodedata yfields="98" xfields="08:10:47"/><nodedata yfields="61" xfields="08:25:48"/>
<nodedata yfields="44" xfields="08:40:49"/><nodedata yfields="82" xfields="08:55:49"/>
<nodedata yfields="83" xfields="09:10:50"/><nodedata yfields="74" xfields="09:25:51"/>
<nodedata yfields="33" xfields="09:40:52"/><nodedata yfields="87" xfields="09:55:52"/>
<nodedata yfields="44" xfields="10:10:53"/><nodedata yfields="45" xfields="10:25:54"/>
<nodedata yfields="26" xfields="10:40:54"/><nodedata yfields="82" xfields="10:55:55"/>
<nodedata yfields="49" xfields="11:10:56"/><nodedata yfields="4" xfields="11:25:57"/>
<nodedata yfields="32" xfields="11:40:58"/><nodedata yfields="20" xfields="11:55:59"/>
</linedata>
<linedata name='南航'>