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Reference data from ArrayCollection from DataGridColumn

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:DataGrid width="500">         <mx:columns>             <mx:DataGridColumn headerText="City" dataField="city" />             <mx:DataGridColumn headerText="Population (within city limits)" dataField="population" />         </mx:columns>         <mx:ArrayCollection>             <mx:Array>                 <mx:Object city="A" state="CA" population="3" />                 <mx:Object city="B" state="NY" population="8" />                 <mx:Object city="C" state="IL" population="2" />                 <mx:Object city="D" state="PA" population="1" />             </mx:Array>         </mx:ArrayCollection>     </mx:DataGrid> </mx:Application>