Here is a basic Adobe Air WindowedApplication set up to launch in full screen mode.
<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()">
<mx:Script>
<![CDATA[
private function init():void
{
systemManager.stage.displayState=flash.display.StageDisplayState.FULL_SCREEN_INTERACTIVE
}
]]>
</mx:Script>
</mx:WindowedApplication>
TypeError: Error #1009: Cannot access a property or method of a null object reference.
I get this error and then it goes to full screen