adding-application.coffee

Application = new Marionette.Application

# this will replace your mainLayout
Application.addRegions
  mainRegion: 'body'

Application.on 'initialize:after', ->
  Backbone.history.start()

# OtherView definition
Application.module 'Views.Submodule', (Submodule, Application, Backbone, Marionete, $, _) ->
  class Submodule.OtherView extends Marionette.ItemView

Application.start()

# somewhere in a router
Application.mainRegion.show(new Application.Submodule.OtherView)