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DataGrid change event

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:VBox>         <mx:DataGrid id="grid" width="500" change="output.text =grid.selectedItem.city">             <mx:columns>                 <mx:DataGridColumn headerText="City" dataField="city" />                 <mx:DataGridColumn headerText="Population" 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:TextInput id="output" width="200" />     </mx:VBox> </mx:Application>