Ember Router reopen

gistfile1.js

App = Ember.Application.create();

App.RootState = Em.State.extend({
    index : Em.State.extend({
        route : '/'
    }),
    main: Em.State.extend({
        route : '/main',
        index : Em.State.extend({
            route : '/'
        })
    })
});

App.Router = Ember.Router.extend({
    location : 'hash',
    enableLogging : true,
    root : App.RootState
});

// later...

App.RootState.reopen({
    module: Em.State.extend({
        route : '/module',
        index : Em.State.extend({
            route : '/'
        })
    })
});

App.initialize();​