example.js

Editor.Element = Em.Object.extend({
  x: 0,
  y:0,
  witdth: 0, 
  height: 0
});

// don't forget to use set / get for access the properties of the model

Editor.elements = Em.ArrayController.create({
  // use pushObject or popOBject, remove Object and set the content on the property
});

Editor.CollectionView = Em.CollectionView.extend({

  contentBinding: Em.Binding.oneWay('Editor.elements.content'),

  itemViewClass: Em.View.extend({
     // the content of this class will be each Editor.Element

     // set observes on either the content or content.x content.y content.width
     // and access this.$()
     didInsertElement: function() {
      // do any setup with this.$()
     }, 
     template: Em.Handlebars.compile('my tetxt')
  })
})