flex 用itemRenderer修改datagrid中单

<mx:AdvancedDataGridColumn dataField="NAME"                                      headerText="NAME"> 
                                                     <mx:itemRenderer> 
                    <mx:Component>                           <mx:HBox> 
                             <mx:Script>                              <![CDATA[  
                              import mx.states.SetStyle;                                     
                              public function get value():String{                                      return show.text;  
                             }                                 
                              override public function set data(value:Object):void{                                      
                                  if(value != null){                                        super.data = value;  
                                      if(value.NAME != null)                                      {  
                                        show.text = value.NAME;                                          if((show.text).indexOf("er") != -1){setStyle("backgroundColor","red");}  
                                        else setStyle("backgroundColor","yellow");                                           
                                    }else{                                          setStyle("backgroundColor","green");  
                                    }                                    }  
                              }                               ]]> 
                             </mx:Script>                             <mx:Label id="show"/> 
                          </mx:HBox>                       </mx:Component> 
                 </mx:itemRenderer>              
           </mx:AdvancedDataGridColumn>