OK, i got it!!
i made the chart explode on mouse over a wedge, working great !
next step: on click on a wedge the wedge will change color (or alpha
or ratio), click on another wedge will revert the previous wedge to
its original color and will change color of current wedge.
i got the start of it, but i m stuck!!
i used setStyle to change the color but there must be a better way -
like accessing the wedge directly and changing its own style.

HOW ???

here is the code:

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
initialize="init()">
    <mx:Script><![CDATA[
        import mx.charts.events.ChartItemEvent;
        import mx.collections.ArrayCollection;
        import mx.controls.Alert;
        [Bindable]
        private var dataSet:ArrayCollection = new ArrayCollection([
            {Month: "Jan", Expenses: 150},
            {Month: "Feb", Expenses: 200},
            {Month: "BLOODKLAAT", Expenses: 600},
            {Month: "Mar", Expenses: 500}
        ]);
        
        private var lastIndex:Number;
        private function boom(e:ChartItemEvent):void {
            // explode wedge
            if(e.hitData.chartItem.index != lastIndex){
                    var explodeWedge:Array = [];
                        explodeWedge[e.hitData.chartItem.index] = 0.1;
                    chart.series[0].perWedgeExplodeRadius = explodeWedge;
            }
            lastIndex = e.hitData.chartItem.index
        }
        
        private function changeColor(e:ChartItemEvent):void{
                chart.series[0].setStyle("fills",[0xff0000, 0x00ff00,
0x0000ff, 0x000000]);
        }
        
        private function init():void {
            chart.addEventListener(ChartItemEvent.ITEM_ROLL_OVER,boom);
            chart.addEventListener(ChartItemEvent.ITEM_CLICK,changeColor);
        }
    ]]></mx:Script>
    <mx:SeriesInterpolate id="chartEffect" elementOffset="10"/>
    <mx:Panel title="Event handling" verticalGap="0">
        <mx:PieChart id="chart" dataProvider="{dataSet}" >
                <mx:series>
                        <mx:PieSeries labelPosition="inside" field="Expenses"
showDataEffect="chartEffect" >
                                <mx:fills>
                                                <mx:SolidColor color="#ff0000" 
/>
                                                <mx:SolidColor color="#00ff00" 
/>
                                                <mx:SolidColor color="#0000ff" 
/>
                                                <mx:SolidColor color="#00ffff" 
/>
                                </mx:fills>
                        </mx:PieSeries>
                </mx:series>
        </mx:PieChart>
    </mx:Panel>
</mx:Application>




--- In [email protected], "Ely Greenfield" <[EMAIL PROTECTED]> wrote:
>
>  
>  
>  
> What error are you getting?
>  
> PieSeries has a property called called perWedgeExplodeRadius. This is an
> array of values from 0 to 1. The Nth value in this array corresponds to
> how far the nth value in the dataProvider should be exploded. 0 is no
> explode, 1 is fully exploded (which means there's no room to actually
> render anything, so probably not what you want. Choose something in
> between).
>  
> So get the index of the item under the mouse (listen for itemRollOver
> and itemRollOut events), and update the perWedgeExplodeRadius property
> accordingly.
>  
> Ely.
>  
>  
> 
> ________________________________
> 
> From: [email protected] [mailto:[EMAIL PROTECTED] On
> Behalf Of shemeshkale
> Sent: Tuesday, October 31, 2006 12:42 AM
> To: [email protected]
> Subject: [flexcoders] how to explode a wedge on mouse over?
> 
> 
> 
> hello,
> i have a pieChart.
> how do i make a specific wedge explode on mouse over on it?
> mouse out will revert the explosion.
> 
> plus:
> how do i alert the wedge under the mouse?
> got this : mouseOver="Alert.show('over: '+event.hitData.index)"
> but it is error, what is right?
>





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