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Using a label function to support a multicolumn DataGrid

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     backgroundColor="white">     <mx:Script>                  import mx.collections.ArrayCollection;         [Bindable]         public var myAC:ArrayCollection = new ArrayCollection([             {name:"A", username:"a",dtJoined:"01/02/2011"},             {name:"T", username:"t",dtJoined:"03/12/201"},         ]);                  public function formatDate(rowItem:Object,column:DataGridColumn):String         {             var retVal:String = "";             if(column.dataField == "dtJoined")                 retVal = dFmt.format(rowItem.dtJoined);             else if(column.dataField == "dtLogin")                 retVal = dFmt.format(rowItem.dtLogin);             return retVal;         }            </mx:Script>     <mx:DateFormatter id="dFmt" formatString="MM/DD/YY" />     <mx:DataGrid id="dg" width="500" height="100" dataProvider="{myAC}">         <mx:columns>             <mx:DataGridColumn dataField="name" headerText="Name" />             <mx:DataGridColumn dataField="username" headerText="Username" />             <mx:DataGridColumn dataField="dtJoined" headerText="Joined" labelFunction="formatDate"/>         </mx:columns>     </mx:DataGrid> </mx:Application>