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Flex: ToolTip on Spark DataGrid Rows

We can use Spark DataGrid's showDataTips and dataTipFunction properties to show customized tool tips on the rows.
An example showing this:
<?xml version="1.0" encoding="utf-8"?>
<s:Application 
    initialize="onInitialize()"
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark">

    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.utils.StringUtil;

            private static function fnDataTip(item:Object, column:GridColumn):String
            {
                var toolTip:String = item[column.dataTipField != null ? column.dataTipField : column.dataField];
                if (toolTip == null || StringUtil.trim(toolTip) == "")
                    toolTip = "";

                if (item.hasOwnProperty("toolTipComment") && item.toolTipComment != null && item.toolTipComment.length > 0)
                    return (toolTip == "") ? item.toolTipComment : (toolTip + "\n" + item.toolTipComment);
                else
                    return toolTip;
            }

            [Bindable]
            private var acDataProvider:ArrayCollection = new ArrayCollection();

            private function onInitialize():void
            {
                acDataProvider.addItem({ code: "A", value: "10" });
                acDataProvider.addItem({ code: "B", value: "20", toolTipComment: "ToolTip comment" });
            }
        ]]>
    </fx:Script>

    <s:DataGrid 
        dataProvider="{acDataProvider}"
        showDataTips="true"
        dataTipFunction="fnDataTip">
        <s:columns>
            <s:ArrayList>
                <s:GridColumn dataField="code"
                    headerText="Code"/>
                <s:GridColumn dataField="value"
                    headerText="Value"/>
            </s:ArrayList>
        </s:columns>
    </s:DataGrid>
</s:Application>
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