Flex DataGridの自動ナンバリング例

<mx:DataGridColumn headerText="SerialNumber" labelFunction="lfRowNum" />

//dg auto-numbering
private function lfRowNum(oItem:Object,iCol:int):String
{
var iIndex:int = statistidgCla.dataProvider.getItemIndex(oItem) + 1;
return String(iIndex);
}