Triggering effects when a container’s visibility is changed

The following example shows you how you can trigger effects when the visible property changes on a Flex container or control by using the hideEffect and showEffect effects

<?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>