code: function(view){
  
      this.ensureEl();
  
      var isViewClosed = view.isClosed || _.isUndefined(view.$el);
  
      var isDifferentView = view !== this.currentView;
  
      if (isDifferentView) {
        this.close();
      }
  
      view.render();
  
      if (isDifferentView || isViewClosed) {
        this.open(view);
      }
      
      this.currentView = view;
  
      Marionette.triggerMethod.call(this, "show", view);
      Marionette.triggerMethod.call(view, "show");
    }
docs: Displays a backbone view instance inside of the region. Handles calling the `render` method for you. Reads content directly from the `el` attribute. Also calls an optional `onShow` and `close` method on your view, just after showing or just before closing the view, respectively.