Use callLater to invoke a method

       
<?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>

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Use callLater to invoke a method : CallLater « Data Model « Flex

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