Use ColumnSet, BarSet, and AreaSet classes to combine groups of chart series,
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<!-- charts/UsingBarSets.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="initApp()">
<mx:Script>
import mx.charts.Legend;
import mx.charts.BarChart;
import mx.charts.series.BarSet;
import mx.charts.series.BarSeries;
import mx.collections.ArrayCollection;
[Bindable]
private var yearlyData:ArrayCollection = new ArrayCollection([
{month:"January", revenue:120, costs:45,overhead:102, oneTime:23},
{month:"February", revenue:108, costs:42,overhead:87, oneTime:47},
{month:"March", revenue:150, costs:82,overhead:32, oneTime:21},
{month:"April", revenue:170, costs:44,overhead:68},
{month:"May", revenue:250, costs:57,overhead:77, oneTime:17},
{month:"June", revenue:200, costs:33,overhead:51, oneTime:30},
{month:"July", revenue:145, costs:80,overhead:62, oneTime:18},
{month:"August", revenue:166, costs:87,overhead:48},
{month:"September", revenue:103, costs:56,overhead:42},
{month:"October", revenue:140, costs:91,overhead:45, oneTime:60},
{month:"November", revenue:100, costs:42,overhead:33, oneTime:67},
{month:"December", revenue:182, costs:56,overhead:25, oneTime:48},
{month:"May", revenue:120, costs:57,overhead:30}
]);
private function initApp():void {
var c:BarChart = new BarChart();
c.dataProvider = yearlyData;
var vAxis:CategoryAxis = new CategoryAxis();
vAxis.categoryField = "month";
c.verticalAxis = vAxis;
var mySeries:Array = new Array();
var outerSet:BarSet = new BarSet();
outerSet.type = "clustered";
var series1:BarSeries = new BarSeries();
series1.xField = "revenue";
series1.displayName = "Revenue";
outerSet.series = [series1];
var innerSet:BarSet = new BarSet();
innerSet.type = "stacked";
var series2:BarSeries = new BarSeries();
var series3:BarSeries = new BarSeries();
series2.xField = "costs";
series2.displayName = "Recurring Costs";
series3.xField = "oneTime";
series3.displayName = "One-Time Costs";
innerSet.series = [series2, series3];
c.series = [outerSet, innerSet];
var l:Legend = new Legend();
l.dataProvider = c;
panel2.addChild(c);
panel2.addChild(l);
}
</mx:Script>
<mx:Panel title="Mixed Sets Chart Created in MXML" id="panel1">
<mx:BarChart id="myChart" dataProvider="{yearlyData}">
<mx:verticalAxis>
<mx:CategoryAxis categoryField="month" />
</mx:verticalAxis>
<mx:series>
<mx:BarSet type="clustered">
<mx:BarSeries xField="revenue" displayName="Revenue" />
<mx:BarSet type="stacked">
<mx:BarSeries xField="costs"
displayName="Recurring Costs" />
<mx:BarSeries xField="oneTime"
displayName="One-Time Costs" />
</mx:BarSet>
</mx:BarSet>
</mx:series>
</mx:BarChart>
<mx:Legend dataProvider="{myChart}" />
</mx:Panel>
<mx:Panel title="Mixed Sets Chart Created in ActionScript" id="panel2">
</mx:Panel>
</mx:Application>
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