code: function() {
        _.each(this.modelsToRender(), function(model) {
          var itemView = this.getItemViewFromModel(model);
          if (itemView) {
            itemView.delegateEvents();
            if (!itemView.__attachedCallbackInvoked && itemView.isAttached()) {
              itemView.__invokeAttached();
            }
            itemView.activate();
          } else {
            // Shouldn't get here. Item view is missing...
          }
        }, this);
      }
docs: Completes each item view's lifecycle of being attached to a parent.
  Because the item views are attached in a non-standard way, it's important to make sure
  that the item views are in the appropriate state after being attached as one fragment.
  @method __cleanupItemViewsAfterAttachedToParent
  @private