using Marionette.Controller as a "mediator" to coordinate multiple views and/or other objects

someProcess.js

// see this article: http://lostechies.com/derickbailey/2012/05/10/modeling-explicit-workflow-with-code-in-javascript-and-backbone-apps/
// replace the object literal in that example with a Marionette.Controller
// 
// an example:

var SomeProcess = Marionette.Controller.extend({
  initialize: function(options){
    this.region = options.region;
    this.model = options.model;
  },

  show: function(){
    var this.layout = this.getLayout(this.model);
    this.region.show(this.layout);
  },

  onClose: function(){
    if (this.layout){
      this.layout.close();
    }
  },

  getLayout: function(model){
    var layout = new MyLayout({
      model: model
    });

    this.listenTo(layout, "render", function(){
      this.showMenu(model, layout.menuRegion);
      this.showContent(model.children, layout.contentRegion);
    });
  },

  showMenu: function(model, region){
    var menu = new MyMenu({
      model: model
    });

    this.listenTo(menu, "click:item", this.changeContent);

    region.show(menu);
  },

  showContent: function(collection, region){
    var content = new MyContent({
      collection: collection
    });

    this.listenTo(content, "some:event", this.doMoreStuff);

    region.show(content);
  },

  // ... changeContent & doMoreStuff functions go here
});





// use of this object
// ------------------

var process = new SomeProcess({
  region: MyApp.someRegion,
  model: someModel
});

// calling the `show` method
// that we added to the object
process.show();

// some time later when we're
// done with this process, 
// close it
process.close();