Why the registered event cannot be heard (files content included)

Question

Hi,
I posted a question earlier today about a problem using external customer event along with a chart created with actionscript. I think the files are better than words. If an expert can take a look at this and let me know how the event cannot be heard and how it can be heard, I will really appreciate it.
3 files:
===============================================================
1. ChartIt.mxml
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="init()" xmlns:local="*">
    <mx:Script>
        <![CDATA[
            import mx.charts.PieChart;
            import org.allus.examples.UpdateChartEvent;
            import org.allus.examples.GenCharts;
            import mx.collections.ArrayCollection;
            private var pieChart:PieChart = new PieChart();
            private var genCharts:GenCharts = new GenCharts();
            [Bindable]
            private var chartData:ArrayCollection = new ArrayCollection( [
            { Country: "USA", Gold: 35, Silver:39, Bronze: 29 },
            { Country: "China", Gold: 32, Silver:17, Bronze: 14 },
            { Country: "Russia", Gold: 27, Silver:27, Bronze: 38 } ]);
            private function init():void {
                pieChart = genCharts.createPieChart(chartData, "Gold");
                box.addChild(pieChart);
                pieChart.addEventListener(UpdateChartEvent.UpdateChart, pieDoubleClicked);
            private function pieDoubleClicked(e:UpdateChartEvent):void {
                trace("the pie chart was double clicked");
        ]]>
    </mx:Script>
    <mx:VBox width="50%" height="50%" id="box" borderStyle="solid"/>
</mx:Application>
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2. GenChart.as:
package org.allus.examples
    import mx.charts.PieChart;
    import mx.charts.series.PieSeries;
    import mx.charts.events.ChartItemEvent;
    import mx.collections.ArrayCollection;
    import flash.events.EventDispatcher;
    import flash.events.Event;
    import org.allus.examples.UpdateChartEvent;
    public class GenCharts extends EventDispatcher
        private var apieChart:PieChart;
        private var pieSeries:PieSeries;
        public function GenCharts() {
            super();
        public function createPieChart(chartData:ArrayCollection, by:String):PieChart {
            apieChart = new PieChart();
            apieChart.percentWidth = 100;
            apieChart.percentHeight = 100;
            apieChart.showDataTips = true;
            apieChart.dataProvider = chartData;
            apieChart.addEventListener(ChartItemEvent.ITEM_DOUBLE_CLICK, pieChartItemDoubleClickedHandler);
            apieChart.doubleClickEnabled = true;
            var mySeries:Array = new Array();
            pieSeries = new PieSeries();                   
            pieSeries.field = by;               
            mySeries.push(pieSeries);
            apieChart.series = mySeries;
            return apieChart;
        private function pieChartItemDoubleClickedHandler(evt:ChartItemEvent):void {
            dispatchEvent(new UpdateChartEvent(UpdateChartEvent.UpdateChart));
==============================================
3. UpdateChartEvent.as
package org.allus.examples
    import flash.events.Event;
    public class UpdateChartEvent extends Event
        public static const UpdateChart:String = "updateChart";
        public function UpdateChartEvent(eventName:String) {
            trace("the event was triggered.");
            super(eventName);

Answer 1

Have your apieChart dispatch the event
private function pieChartItemDoubleClickedHandler(evt:ChartItemEvent):void {     apieChart.dispatchEvent(new UpdateChartEvent(UpdateChartEvent.UpdateChart));