<?xml version="1.0" ?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
verticalAlign="middle" layout="vertical">
<mx:states>
<mx:State name="OneOnly">
<mx:SetProperty target="{p2}" name="visible" value="false" />
<mx:SetProperty target="{p2}" name="includeInLayout" value="false" />
</mx:State>
</mx:states>
<mx:transitions>
<mx:Transition id="toOneOnly" fromState="*" toState="OneOnly">
<mx:Sequence id="t1" targets="{[p2]}">
<mx:Iris showTarget="false" duration="500" />
<mx:SetPropertyAction name="visible" />
<mx:SetPropertyAction target="{p2}" name="includeInLayout" />
</mx:Sequence>
</mx:Transition>
</mx:transitions>
<mx:Panel id="p1" title="One" width="100" height="100">
<mx:Label text="One" />
</mx:Panel>
<mx:Panel id="p2" title="Two" width="100" height="100">
<mx:Label text="Two" />
</mx:Panel>
<mx:Button id="b1" label="Change state" click="currentState = currentState == 'OneOnly' ? '' : 'OneOnly';" />
</mx:Application>
| 
