Hmm... those Stats don't work for me. As soon as I put the line
into my code (like the author does it in his intro book) I get a null pointer exception in
nativeStage = Starling.current.nativeStage;
I already use this first application with the newest starling framework version from github so the nativeStage should be accesible. And it seems so because the assignment works in the Startup class source but not in Stats class.
I tested it in seceral browsers. Now I've run out of ideas.