[flexcoders] How to disable the default drop shadow for a chartseries?

[anewgene]

Hi, group,
     In some cases(e.g., to display a lot of small data points), I 
want to disable the drop shadow for the better appearance. However, 
in 
the following test code, there is no effect at all even I set all 
filters to empty arrays.

     Can anybody explain why? Thanks in advance.

lei

//----sample code-----
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="absolute" applicationComplete="init()">
        
        <mx:Canvas left="0" bottom="0" right="0" top="0">
        <mx:Script>
                <![CDATA[
                     import mx.collections.ArrayCollection;
                     [Bindable]
                     public var expenses:ArrayCollection = new 
ArrayCollection([
                        {Month:"Jan", Profit:2000, Expenses:1500},
                        {Month:"Feb", Profit:1000, Expenses:200},
                        {Month:"Mar", Profit:1500, Expenses:500}
                     ]);
                                
                        public function init():void{
                                barchart2.filters = [];
                                series1.filters=[];
                                series2.filters=[];
                                barchart2.invalidateDisplayList();
                        }                       
                ]]>
        </mx:Script>
        
        
        <mx:BarChart id='barchart2' width="100%" height="100%"  
dataProvider="{expenses}" >

        <mx:verticalAxis>
           <mx:CategoryAxis 
                dataProvider="{expenses}" 
                categoryField="Month"
           />
        </mx:verticalAxis>
        <mx:series>
           <mx:BarSeries id='series1'
                yField="Month" 
                xField="Profit" 
                displayName="Profit"
           />
           <mx:BarSeries id='series2'
                yField="Month" 
                xField="Expenses" 
                displayName="Expenses"
           />
        </mx:series>
        </mx:BarChart>
        </mx:Canvas>    
        
</mx:Application>