code: function(callback) {
      var _baseView = this;
  
      // Remove all child views in case we are re-rendering through
      // manual .render() or 'refresh' being triggered on the view.
      this.removeChildViews();
      BaseView.getChildViews(this.app, this, function(views) {
        _baseView.childViews = views;
        callback.call(_baseView);
      });
    }
docs: Happens client-side.
  Find all of sub view DOM elements
  Get the view key
  Call this.getView()
  Attach childView