SC.ContainerView bug

container_bug.js

MyApp = {};

MyApp.ContainerView = SC.ContainerView.extend({
  nowShowing: 'MyApp.GreetingView',
  init: function () {
    var ret = arguments.callee.base.apply(this, arguments);
    // I need this line ------------.
    // to have `nowShowing` update  v

    // this.notifyPropertyChange('nowShowing');                                     
    return ret;
  }
});

MyApp.GreetingView = SC.LabelView.extend({
  value: 'Well, hi there!'
});

MyApp.mainPane = SC.MainPane.create();
MyApp.mainPane.appendChild(MyApp.ContainerView.create());
MyApp.mainPane.append();