Upgrade from Burrito to 4.5, Could not resolve MobileApplication tag?

Question

Hello:
As the topic states, I just upgraded from Burrito to 4.5 today. I imported my app and I get the following error:
Could not resolve <s:MobileApplication> to a component implementation.    ...    line 6    Flex Problem
Did they take out MobileApplication? If so how can I support the back button on my Xoom device now?
Paul

Answer 1

MobileApplication was renamed to ViewNavigatorApplication.
Here's an example of how you would cancel the back button in the final 4.5 release:
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView"
        backKeyPressed="view1_backKeyPressedHandler()">
    <fx:Script>
        <![CDATA[
            private function view1_backKeyPressedHandler():void {
                event.preventDefault();
                // do something else here 
        ]]>
    </fx:Script>
</s:View>