 <p>I have made mistake when i add model to collection, I have added a type instead of instance of the type.</p> <pre><code>var backgridModel = Backbone.Model.extend({ }); </code></pre> <p>is the type i should have added </p> <p><code>var row = new backgridModel()</code> instead i have used <code>backgridModel</code> to create a new row.</p>