LayerList Controller Initialize is where all the orchestration happens because we never change the collections at runtime.

LayerListControllerInit.js

        //==================================
        //Controller for the LayerList Module
        //==================================
        var Controller = Backbone.Marionette.Controller.extend({
            initialize: function (options) {
                _.bindAll();
                
                console.log('LayerListMobule:Controller:initialize');
                this.region = options.region;
                
                //The layer list has two collections
                // 1) the list of basemaps
                // 2) list of operational layers
                this.basemapCollection = new LayerCollection(options.mapConfig.basemaps);
                this.layerCollection = new LayerCollection(options.mapConfig.operationalLayers);
                
                //create the views - these are Marionette.CollectionViews that render ItemViews
                this.basemapView = new BasemapListView({collection:this.basemapCollection});
                this.layersView = new LayerListView({collection:this.layerCollection});
                //create our layout that will hold the child views
                this.layout = new LayerListLayoutView();

                //We have to render the layout before we can
                //call show() on the layout's regions
                this.region.show(this.layout);
                this.layout.layerListRegion.show(this.layersView);
                this.layout.basemapRegion.show(this.basemapView);

                //hook up App events to show/hide the panel          
                Viewer.vent.on('View:LayerList', function (name) {
                    console.log('LayerListController caught View:LayerList');
                    $('#layer-list-region').show();
                });
                Viewer.vent.on('View:LayerList:Hide',function(){
                    $('#layer-list-region').hide();
                });
            }
        });