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Set editing position for DataGrid

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" backgroundColor="white">     <mx:Script>                  import mx.collections.ArrayCollection;         import mx.events.DataGridEvent;         import mx.validators.EmailValidator;         import mx.controls.TextInput;                  [Bindable]         public var myAC:ArrayCollection = new ArrayCollection([             {name:"a", email:"a@i.com"},             {name:"b", email:"b@i.com"}]);                  private function onEditEnd(event:DataGridEvent):void         {             if(event.dataField == 'email'){                  var fCell:Array=[event.columnIndex,event.rowIndex];                  event.preventDefault();                  callLater(maintainEdit,fCell);             }         }         private function maintainEdit(colIndex:int,rowIndex:int):void {             var editCell:Object = {columnIndex:colIndex, rowIndex:rowIndex};             dg.editedItemPosition = editCell;         }            </mx:Script>     <mx:DataGrid id="dg" width="350" height="150" dataProvider="{myAC}" itemEditEnd="onEditEnd(event)" editable="true">         <mx:columns>             <mx:DataGridColumn headerText="Name" dataField="name" />             <mx:DataGridColumn headerText="EMail" dataField="email" />         </mx:columns>     </mx:DataGrid> </mx:Application>