Create a VGroup container so the container for the buttons appears above the ViewStack container
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<!-- containers\navigators\VSSimple.mxml -->
<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">
<!-- Create a VGroup container so the container for
the buttons appears above the ViewStack container. -->
<s:VGroup>
<!-- Create an HBox container to hold the three buttons. -->
<mx:HBox borderStyle="solid">
<!-- Define the three buttons.
Each uses the child container identifier
to set the active child container. -->
<s:Button id="searchButton" label="Search Screen"
click="myViewStack.selectedChild=search;" />
<s:Button id="cInfoButton" label="Customer Info Screen"
click="myViewStack.selectedChild=custInfo;" />
<s:Button id="aInfoButton" label="Account Info Screen"
click="myViewStack.selectedChild=accountInfo;" />
</mx:HBox>
<!-- Define the ViewStack and the three child containers and have it
resize up to the size of the container for the buttons. -->
<mx:ViewStack id="myViewStack" borderStyle="solid" width="100%">
<mx:Canvas id="search" label="Search">
<mx:Label text="Search Screen" />
</mx:Canvas>
<mx:Canvas id="custInfo" label="Customer Info">
<mx:Label text="Customer Info" />
</mx:Canvas>
<mx:Canvas id="accountInfo" label="Account Info">
<mx:Label text="Account Info" />
</mx:Canvas>
</mx:ViewStack>
</s:VGroup>
</s:Application>
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