Define a new callback function, dtFunc, that returns a formatted value for the DataTip:
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<!-- charts/CustomDataTips.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import mx.charts.HitData;
import mx.collections.ArrayCollection;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Month:"Jan", Profit:2000, Expenses:1500},
{Month:"Feb", Profit:1000, Expenses:200},
{Month:"Mar", Profit:1500, Expenses:500}
]);
public function dtFunc(hd:HitData):String {
return hd.item.Month + ":<B>$" +
hd.item.Profit + "</B>";
}
</mx:Script>
<mx:Panel title="Bar Chart">
<mx:BarChart id="myChart" dataProvider="{expenses}" showDataTips="true"
dataTipFunction="dtFunc">
<mx:verticalAxis>
<mx:CategoryAxis dataProvider="{expenses}" categoryField="Month"
displayName="Month" />
</mx:verticalAxis>
<mx:horizontalAxis>
<mx:LinearAxis displayName="Amount" />
</mx:horizontalAxis>
<mx:series>
<mx:BarSeries yField="Month" xField="Profit"
displayName="Profit" />
<mx:BarSeries yField="Month" xField="Expenses"
displayName="Expenses" />
</mx:series>
</mx:BarChart>
<mx:Legend dataProvider="{myChart}" />
</mx:Panel>
</mx:Application>
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