frameworks/projects/spark/asdoc/en_US/spark/effects/examples/SetActionEffectExample.mxml

<?xml version="1.0"?>
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<!-- Simple example to demonstrate the s:SetAction class. -->
<s:Application
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">
 
    <!-- Define one view state, in addition to the base state.-->
    <s:states>
        <s:State name="default"/>
        <s:State name="OneOnly"/>
    </s:states> 

    <!-- Define Transition array with one Transition object.-->
    <s:transitions>
        <s:Transition id="toOneOnly" fromState="*" toState="OneOnly">
            <s:Sequence id="t1" targets="{[p2]}">
                <s:Wipe direction="left" duration="350"/>
                <s:SetAction property="visible"/>
                <s:SetAction property="includeInLayout"/>
            </s:Sequence>
        </s:Transition>
    
        <s:Transition id="toAnyFromAny" fromState="*" toState="*">
            <s:Sequence id="t2" targets="{[p2]}">
                <s:SetAction property="includeInLayout"/>
                <s:SetAction property="visible"/>
                <s:Wipe direction="right" duration="350"/>
            </s:Sequence>
        </s:Transition>
    </s:transitions>

    <s:Panel title="SetAction Effect Example"
        width="75%" height="75%">
        <s:layout>
            <s:VerticalLayout paddingTop="10" paddingLeft="10"/>
        </s:layout>

        <s:Panel id="p1" title="One" 
            width="100" height="100">
            <s:Label fontSize="24" text="One"/>
        </s:Panel>
        
        <s:Panel id="p2" title="Two" 
            width="100" height="100"
            visible="true" visible.OneOnly="false"
            includeInLayout="true" includeInLayout.OneOnly="false">
            <s:Label fontSize="24" text="Two"/>
        </s:Panel>
    
        <s:Button id="b1" label="Change state" 
            click="currentState = currentState == 'OneOnly' ? '' : 'OneOnly';"/>
        </s:Panel>
</s:Application>