title: When is DataView available?
body: <p>I am trying to initialize an Ext JS ComboBox when the render event is fired.  However, it appears the DataView for the ComboBox is not available and an exception is thrown (this.view is undefined).  </p>
  
  <p>I can't use the "value" option when I configure a ComboBox as I don't have a value - rather I have a display value.</p>
  
  <p>When can I set the value of a ComboBox?</p>