Removing the drop shadow from a Flex PieChart control

<mx:PieChart id="pieChart"
        dataProvider="{dp.product}"
        height="250"
        width="100%">
    <mx:series>
        <mx:PieSeries id="pieSeries"
                field="@data"
                filters="[]" />
    </mx:series>
</mx:PieChart>

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/11/05/removing-the-drop-shadow-from-a-flex-piechart-control/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">
 
    <mx:Script>
        <![CDATA[
            import mx.controls.Button;
 
            private var defaultFilters:Array;
 
            private function init():void {
                defaultFilters = pieSeries.filters;
            }
 
            private function toggleFilters(evt:Event):void {
                if (Button(evt.currentTarget).selected) {
                    pieSeries.filters = [];
                } else {
                    pieSeries.filters = defaultFilters;
                }
            }
        ]]>
    </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:ApplicationControlBar dock="true">
        <mx:Button label="Toggle filters"
                toggle="true"
                change="toggleFilters(event);" />
    </mx:ApplicationControlBar>
 
    <mx:PieChart id="pieChart"
            dataProvider="{dp.product}"
            height="250"
            width="100%">
        <mx:series>
            <mx:PieSeries id="pieSeries"
                    field="@data" />
        </mx:series>
    </mx:PieChart>
 
</mx:Application>