Flex DataGrid 伪合并单元格实现思路

<?xml version="1.0" encoding="utf-8"?> 
<s:mxdatagriditemrenderer 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="100%" height="100%" 
          
         autodrawbackground="false" 
         creationcomplete="mxitemrenderer1_creationcompletehandler(event)" 
        > 
  <s:layout> 
    <s:verticallayout verticalalign="middle" horizontalalign="center"/> 
  </s:layout> 
  <fx:script> 
    <![cdata[ 
      import mx.collections.arraycollection; 
      import mx.controls.text; 
      import mx.events.flexevent; 
       
      protected function mxitemrenderer1_creationcompletehandler(event:flexevent):void 
      { 
        var txt1:string = lbl.text.split(",")[0]; 
        var txt2:string = lbl.text.split(",")[1]; 
        lbl1.text = txt1; 
        lbl2.text = txt2; 
     
      } 
       
    ]]> 
  </fx:script> 
  <fx:declarations> 
    <!-- 将非可视元素（例如服务、值对象）放在此处 --> 
  </fx:declarations> 
  <s:label id="lbl" text="{datagridlistdata.label}" visible="false" height="0"/> 
   
  <s:vgroup  id="vp" width="100%" height="100%" gap="2" > 
  <s:label  id="lbl1" color="0x000000" textalign="center" verticalalign="middle" width="100%"/> 
  <mx:hrule width="100%" chromecolor="0x999999" alpha="0.3"/> 
  <s:label  id="lbl2" color="0x000000" textalign="center" verticalalign="middle" width="100%"/> 
  </s:vgroup> 
  </s:mxdatagriditemrenderer>