Flex4 DataGrid自动显示行号

不用多说，帖上代码。

如下所示：

	private function lfRowNum(oItem:Object,iCol:int):String
			{
				var iIndex:int = _acDP.getItemIndex(oItem) + 1;
				return String(iIndex);
			}

	<mx:DataGrid id="dgSource" dataProvider="{_acDP}"
					 editable="true" >
			<mx:columns>
				<fx:Array>
					<mx:DataGridColumn headerText="Row#" labelFunction="lfRowNum"  />
					<mx:DataGridColumn headerText="Album" dataField="Album"  />
					<mx:DataGridColumn headerText="Artist" dataField="Artist" />
					<mx:DataGridColumn headerText="Price" dataField="Price" />
				</fx:Array>
			</mx:columns>
		</mx:DataGrid>
	</mx:VBox>