Below I have a quick and dirty way of making the row show up. However if you were looking for the number to move with the item when you sort then you need a different approach and should almost consider adding the number to the data source. As when you sort the data grid it actually rearranges its data source which is shown by the text box i added. Which is always showing the contents of the first index of the array collection.
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute"> <mx:Script> <![CDATA[ import mx.collections.ArrayCollection; [Bindable] private var acTest:ArrayCollection = new ArrayCollection([ {one: "0,1", two: "0,2"}, {one: "1,1", two: "1,2"}, {one: "2,1", two: "2,2"}, {one: "3,1", two: "3,2"}, {one: "4,1", two: "4,2"}, {one: "5,1", two: "5,2"}]); private function LabFunc(item:Object, column:DataGridColumn):String { return (this.acTest.getItemIndex(item).toString()) } ]]> </mx:Script> <mx:DataGrid x="10" y="10" dataProvider="{acTest}" id="grid1"> <mx:columns> <mx:DataGridColumn headerText="Column 1" labelFunction="LabFunc"/> <mx:DataGridColumn headerText="Column 2" dataField="one"/> <mx:DataGridColumn headerText="Column 3" dataField="two"/> </mx:columns> </mx:DataGrid> <mx:TextInput text="{this.acTest.getItemAt(0).one+', '+this.acTest.getItemAt(0).two}" x="320" y="9"/> </mx:Application>
