title: Ext JS - Can I 'chain' methods on a field?
body: <p>HI, 
  I am just trying to set a field value and disable it at the same time.
  Can this be done in ext js? The docs are very weak on this subject.</p>
  
  <p>something like this generates errors:</p>
  
  <pre><code>myForm.getForm().findField('start_date').setValue('').setDisabled(true);
  </code></pre>
  
  <p>I'm used to JQuery which does this sort of thing nicely but haven't had luck with Ext.</p>
  
  <p>Thanks for any help.</p>