Flex中如何利用seriesFilters属性，添加/删除LineChart图表曲线阴影

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalAlign="middle" backgroundColor="white" viewSourceURL="srcview/index.html"> <mx:Script> <!--[CDATA[ private function init(evt:Event):void { var chart:LineChart = evt.currentTarget as LineChart; seriesFilterArr = chart.seriesFilters; } private function checkBox_click(evt:MouseEvent):void { var len:uint = lineChart.seriesFilters.length; if (len > 0) { lineChart.seriesFilters = []; } else { lineChart.seriesFilters = seriesFilterArr; } } ]]--> </mx:Script> <mx:XMLListCollection id="dp"> <mx:source> <mx:XMLList> <quote date="8/27/2007" open="40.38" close="40.81" /> <quote date="8/24/2007" open="40.5" close="40.41" /> <quote date="8/23/2007" open="40.82" close="40.6" /> <quote date="8/22/2007" open="40.4" close="40.77" /> <quote date="8/21/2007" open="40.41" close="40.13" /> <quote date="8/20/2007" open="40.55" close="40.74" /> <quote date="8/17/2007" open="40.18" close="40.32" /> <quote date="8/16/2007" open="39.83" close="39.96" /> <quote date="8/15/2007" open="40.22" close="40.18" /> <quote date="8/14/2007" open="41.01" close="40.41" /> <quote date="8/13/2007" open="41" close="40.83" /> <quote date="8/10/2007" open="41.3" close="41.06" /> </mx:XMLList> </mx:source> </mx:XMLListCollection> <mx:Array id="seriesFilterArr" /> <mx:ApplicationControlBar dock="true"> <mx:CheckBox id="checkBox" label="toggle series filters:" labelPlacement="left" click="checkBox_click(event);" /> </mx:ApplicationControlBar> <mx:LineChart id="lineChart" showDataTips="true" dataProvider="{dp}" width="100%" height="100%" creationComplete="init(event);"> <!-- vertical axis --> <mx:verticalAxis> <mx:LinearAxis baseAtZero="false" title="Price" /> </mx:verticalAxis> <!-- horizontal axis --> <mx:horizontalAxis> <mx:CategoryAxis id="ca" categoryField="@date" title="Date" /> </mx:horizontalAxis> <!-- horizontal axis renderer --> <mx:horizontalAxisRenderers> <mx:AxisRenderer axis="{ca}" canDropLabels="true" /> </mx:horizontalAxisRenderers> <!-- series --> <mx:series> <mx:LineSeries yField="@close" form="curve" displayName="Close" /> <mx:LineSeries yField="@open" form="curve" displayName="Open" /> </mx:series> </mx:LineChart> </mx:Application>