Define custom color and line style for the bubbles
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import mx.collections.ArrayCollection;
[Bindable]
public var myArray:ArrayCollection = new ArrayCollection([
{Rank:1, Country:"A", GDP:1},
{Rank:2, Country:"B", GDP:6},
{Rank:3, Country:"C", GDP:4},
{Rank:4, Country:"D", GDP:2}
]);
</mx:Script>
<mx:SolidColor id="scId" color="yellow" alpha=".3"/>
<mx:Stroke id="strokeId" color="yellow" weight="4"/>
<mx:Panel title="BubbleChart">
<mx:BubbleChart id="myChart" showDataTips="true">
<mx:series>
<mx:BubbleSeries
dataProvider="{myArray}"
displayName="GDP"
xField="Rank"
yField="GDP"
radiusField="GDP"
fill="{scId}"
stroke="{strokeId}" />
</mx:series>
</mx:BubbleChart>
<mx:Legend dataProvider="{myChart}"/>
</mx:Panel>
</mx:Application>
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