title: extjs combobox model
body: <p>Is there a way to bind a store to a ExtJS ComboBox without creating a js model (ExtJS 4.1)? <br />
  To populate a users combobox I'll always need to set up the model first? I would like to skip the following code for each combobox:</p>
  
  <pre><code>Ext.define('User',{extend:'Ext.data.Model',idProperty:'Id',fields:['Id','Name']});
  </code></pre>