Define an area chart in which each series in the chart uses a solid fill with the same level of transparency:
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<!-- charts/AlphaFills.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import mx.collections.ArrayCollection;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Month:"Jan", Profit:2000, Expenses:1500, Amount:450},
{Month:"Feb", Profit:1000, Expenses:200, Amount:600},
{Month:"Mar", Profit:1500, Expenses:500, Amount:300}
]);
</mx:Script>
<mx:Panel title="Area Chart">
<mx:AreaChart id="myChart" dataProvider="{expenses}"
showDataTips="true">
<mx:horizontalAxis>
<mx:CategoryAxis dataProvider="{expenses}"
categoryField="Month" />
</mx:horizontalAxis>
<mx:series>
<mx:AreaSeries yField="Profit" displayName="Profit">
<mx:areaStroke>
<mx:Stroke color="0x9A9A00" weight="2" />
</mx:areaStroke>
<mx:areaFill>
<mx:SolidColor color="0x7EAEFF" alpha=".3" />
</mx:areaFill>
</mx:AreaSeries>
<mx:AreaSeries yField="Expenses" displayName="Expenses">
<mx:areaStroke>
<mx:Stroke color="0x9A9A00" weight="2" />
</mx:areaStroke>
<mx:areaFill>
<mx:SolidColor color="0xAA0000" alpha=".3" />
</mx:areaFill>
</mx:AreaSeries>
</mx:series>
</mx:AreaChart>
<mx:Legend dataProvider="{myChart}" />
</mx:Panel>
</mx:Application>
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