Sounds like your call to the tracking results in an error, hence the go to next scene is never reached.
From the page you linked, here is an example of how to call google analytics from the code.
Note that in order to user libraries such as google analytics you need to load the library itself. Also, for better error messages you can open up the developer inspector in chrome and check the console for any error statements.
_gaq.push(['_trackEvent', 'Videos', 'Play', 'Baby\'s First Birthday']);
//and then you could call the controller