// A mixin for `Em.ContainerView` that allows an initial render from
// a template, followed by further additions by mutating childViews.
// Note that the template should *only* contain calls to
// `{{childView}}`
App.Mixins.TemplateContainerView = Em.Mixin.create({

  render: function() {
    if (!this.get('_renderedFromTemplate')) {
      Em.View.prototype.render.apply(this, arguments);
      this.set('_renderedFromTemplate', true);
    } else {
      return this._super.apply(this, arguments);
    }
  }

});

App.Views.TemplateContainerView = Em.ContainerView.extend(App.Mixins.TemplateContainerView);