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The following example shows how you can position callouts in a PieChart control’s pie series by setting the labelPosition

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[

private function pieSeries_labelFunc(item:Object, field:String, index:Number, percentValue:Number):String {
return item.@label + ": " + item.@data + " (" + percentValue.toFixed(2) + "%)";
}

]]>
</mx:Script>

<mx:XML id="dp">
<products>
<product label="Product 1" data="3" />
<product label="Product 2" data="1" />
<product label="Product 3" data="4" />
<product label="Product 4" data="1" />
<product label="Product 5" data="5" />
<product label="Product 6" data="9" />
</products>
</mx:XML>

<mx:Array id="labelPositionArr">
<mx:Object label="callout" />
<mx:Object label="inside" />
<mx:Object label="insideWithCallout" />
<mx:Object label="none" />
<mx:Object label="outside" />
</mx:Array>

<mx:ApplicationControlBar dock="true">
<mx:Label text="labelPosition:" />
<mx:ComboBox id="comboBox" dataProvider="{labelPositionArr}" />
</mx:ApplicationControlBar>

<mx:PieChart id="pieChart" dataProvider="{dp.product}" height="250" width="100%">
<mx:series>
<mx:PieSeries id="pieSeries" field="@data" labelPosition="{comboBox.selectedItem.label}" labelFunction="pieSeries_labelFunc" />
</mx:series>
</mx:PieChart>

</mx:Application>