Use Event object to get a reference to the clicked ColumnSeries.
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<!-- charts/SimpleDrillDown.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" height="100%"
width="100%" creationComplete="initApp()">
<mx:Script>
import mx.collections.ArrayCollection;
[Bindable]
public var dpac:ArrayCollection = new ArrayCollection ([
{ date:"01/01/2006", cash:50000,stocks:198192, retirement:130101,home:750000, other:19148 },
{ date:"02/01/2006", cash:50000,stocks:210309, retirement:143707,home:760000, other:19493 },
{ date:"03/01/2006", cash:50000,stocks:238992, retirement:169529,home:770000, other:19933 },
{ date:"04/01/2006", cash:50000,stocks:292269, retirement:242596,home:770000, other:21445 }]);
public var initSeriesArray:Array = new Array();
public var level:Number = 1;
public var newSeries:Array;
private function initApp():void {
// Get initial series Array -- to be reloaded when it returns
// from a drill down.
initSeriesArray = chart.series;
}
private function zoomIntoSeries(e:Event):void {
newSeries = new Array();
if (level == 1) {
newSeries.push(e.currentTarget);
level = 2;
} else {
newSeries = initSeriesArray;
p1.title = "Net Worth";
level = 1;
}
chart.series = newSeries;
}
</mx:Script>
<mx:Panel id="p1" title="Net Worth">
<mx:ColumnChart id="chart" dataProvider="{dpac}" type="stacked"
showDataTips="true">
<mx:series>
<mx:ColumnSeries id="s1" displayName="Cash" yField="cash"
xField="date" click="zoomIntoSeries(event)" />
<mx:ColumnSeries id="s2" displayName="Stocks" yField="stocks"
xField="date" click="zoomIntoSeries(event)" />
<mx:ColumnSeries id="s3" displayName="Retirement"
yField="retirement" xField="date"
click="zoomIntoSeries(event)" />
<mx:ColumnSeries id="s4" displayName="Home" yField="home"
xField="date" click="zoomIntoSeries(event)" />
<mx:ColumnSeries id="s5" displayName="Other" yField="other"
xField="date" click="zoomIntoSeries(event)" />
</mx:series>
<mx:horizontalAxis>
<mx:DateTimeAxis title="Date" dataUnits="months" />
</mx:horizontalAxis>
</mx:ColumnChart>
<mx:Legend dataProvider="{chart}" />
</mx:Panel>
</mx:Application>
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