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 >