Binding bug??

binding_bug.js

Tce.mainPage = SC.Page.design({

  // The main pane is made visible on screen as soon as your app is loaded.
  // Add childViews to this pane for views to display immediately on page 
  // load.
  mainPane: SC.MainPane.design({
    childViews: 'myCustomView'.w(),

    myCustomView: SC.View.design({
      childViews: ['checkbox'],
      layout: { centerX: 0, centerY: 20, width: 200, height: 18 },

      isSelected: YES,

      checkbox: SC.CheckboxView.design({
        layout: { left: 0, top: 0, right: 0, bottom: 0 },
        isSelectedBinding: '.parentView.isSelected'
      })
    })
  })
});