dispatchEvent で任意のプロパティを渡す DynamicEvent

/**
 * Copyright matsu ( http://wonderfl.net/user/matsu )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/iCwZ
 */

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
                             xmlns:s="library://ns.adobe.com/flex/spark" 
                             xmlns:mx="library://ns.adobe.com/flex/mx"
                             creationComplete="creationCompleteHandler(event)">
    <fx:Declarations>
        <!-- 非ビジュアルエレメント (サービス、値オブジェクトなど) をここに配置 -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import mx.events.DynamicEvent;
            import mx.events.FlexEvent;
            protected function creationCompleteHandler(event:FlexEvent):void
            {
                testButton.addEventListener(MouseEvent.CLICK, testButtonClick);
                addEventListener("ClickComplete", clickCompleteHandler);
            }
            private function testButtonClick(event:MouseEvent):void
            {
                var dynamicEvent:DynamicEvent = new DynamicEvent("ClickComplete");
                dynamicEvent.test = "Test";
                dispatchEvent(dynamicEvent);
            }
            private function clickCompleteHandler(dynamicEvent:DynamicEvent):void
            {
                testLabel.text = dynamicEvent.test;
            }
        ]]>
    </fx:Script>
    <s:VGroup>
        <s:Label text="DynamicEvent Test" fontSize="20"/>
        <s:HGroup verticalAlign="middle">
            <s:Button id="testButton" label="click"/>
            <s:Label id="testLabel"/>
        </s:HGroup>
    </s:VGroup>
</s:Application>