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Select the last row in a Grid

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">   <mx:Script>            import mx.collections.ArrayCollection;                  [Bindable] private var gridArrayCollection:ArrayCollection = new ArrayCollection();       private function addGridItem(event:Event):void        {         gridArrayCollection.addItem(NameInput.text);         callLater(selectNewRow);       }                private function selectNewRow():void        {         nameGrid.selectedIndex = nameGrid.rowCount;       }               </mx:Script>     <mx:VBox width="100%" height="100%">         <mx:DataGrid id="nameGrid" dataProvider="{gridArrayCollection}" width="100%" height="100%">           <mx:columns>             <mx:DataGridColumn dataField="firstName" headerText="First Name"/>           </mx:columns>         </mx:DataGrid>         <mx:Label text="Name:" />         <mx:TextInput id="NameInput" />         <mx:Button label="Enter New Item" click="addGridItem(event)"/>   </mx:VBox> </mx:Application>