<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:states>
<mx:State name="NewButton">
<mx:AddChild relativeTo="{h1}" position="firstChild">
<mx:Button id="buttonNew" label="New Button" />
</mx:AddChild>
</mx:State>
</mx:states>
<mx:HBox id="h1">
<mx:Button label="Change State"
click="currentState = currentState=='NewButton' ? '':'NewButton';" />
</mx:HBox>
</mx:Application>
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