gistfile1.txt

Rapid.itemController = SC.ObjectController.create({
  //set your item .set('content', item)
});
------------------------------------------------------------------------------------
progressView: Rapid.ProgressView.design({
  layout: {centerX:0, centerY:0, height:150, width:150, border:0},
  isVisibleBinding: SC.Binding.from('Rapid.itemController*status').transform(function(value) {
    return !!(value & SC.Record.BUSY);
  })
})