<mx:ViewStack 
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark"
    width="800" height="200" >
    
    <!-- index 0 -->
    <s:NavigatorContent id="nc1" width="100%" height="100%" label="NavigatorContent One" >
        <mx:Label id="lbl1" text="hollandaise sauce" />
    </s:NavigatorContent>
    
    <!-- index 1 -->
    <mx:Canvas id="canvas1" width="100%" height="100%" label="Canvas One" >
        <mx:Label id="lbl2" text="wasabe" />
    </mx:Canvas>

</mx:ViewStack>