触发效果当容器的可见性改变时

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<?xml version="1.0" encoding="utf-8"?><!-- http://blog.flexexamples.com/2007/09/20/triggering-effects-when-a-containers-visibility-is-changed/ --><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"        layout="vertical"        verticalAlign="middle"        backgroundColor="white">    <mx:Zoom id="zoom" />    <mx:ApplicationControlBar dock="true">        <mx:Button label="hide"                click="panel.visible = false;"                enabled="{panel.visible}" />        <mx:Button label="show"                click="panel.visible = true;"                enabled="{!panel.visible}" />    </mx:ApplicationControlBar>    <mx:Panel id="panel"            title="title"            status="status"            showEffect="{zoom}"            hideEffect="{zoom}"            width="100%"            height="100%">        <mx:ControlBar>            <mx:Label text="control bar" />        </mx:ControlBar>    </mx:Panel></mx:Application>