Define a custom component inline by using the tag.
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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- charts/LabelRendererWithToolTips.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
initialize="setupDP()" width="550" height="600">
<fx:Script>
import mx.collections.ArrayCollection;
import mx.charts.ColumnChart;
[Bindable]
private var ac:ArrayCollection;
public function setupDP():void{
ac = new ArrayCollection([
[ "Label 1 is short.", 200000],
[ "Label 2 is a fairly long label.", 150000],
[ "Label 3 is an extremely long label. It contains 95 characters and will likely be truncated.", 40000]
]);
}
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:Panel title="Column Chart">
<s:layout>
<s:VerticalLayout />
</s:layout>
<mx:ColumnChart id="bc1" showDataTips="true"
dataProvider="{ac}">
<mx:series>
<mx:ColumnSeries xField="0" yField="1" />
</mx:series>
<mx:verticalAxis>
<mx:LinearAxis id="va1" />
</mx:verticalAxis>
<mx:horizontalAxis>
<mx:CategoryAxis id="ha1" dataProvider="{ac}"
categoryField="0" />
</mx:horizontalAxis>
<mx:horizontalAxisRenderers>
<mx:AxisRenderer axis="{ha1}" canDropLabels="false">
<mx:labelRenderer>
<fx:Component>
<mx:Label toolTip="{this.myTip}">
<fx:Script>
[Bindable]
private var myTip:String;
override public function set data(value:Object):void{
if(value == null)
return;
myTip = value.text;
var length:int = value.text.toString().length;
if (length > 20) {
text = value.text.toString().substr(0, 20) + "...";
} else {
text = value.text;
}
}
</fx:Script>
</mx:Label>
</fx:Component>
</mx:labelRenderer>
</mx:AxisRenderer>
</mx:horizontalAxisRenderers>
<mx:verticalAxisRenderers>
<mx:AxisRenderer axis="{va1}" canDropLabels="false" />
</mx:verticalAxisRenderers>
</mx:ColumnChart>
<s:Label id="l1" color="white"
text="Hover over the horizontal axis's labels to see the entire title rendered as a ToolTip." />
</s:Panel>
</s:Application>
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