I'm trying to access an instance of a controller that has been wired automatically using App.initialize();
I've tried the below but it returns a Class not an instance.
Ember.get('App.router.invitesController')
I have a quick post about this exact subject on my Blog. It's a little big of a different method, but seems to work well for Ember.js RC1.
Check it out at: http://emersonlackey.com/article/emberjs-instance-of-controller-and-views
The basic idea is to do something like:
var myController = window.App.__container__.lookup('controller:Posts');