title: Ext.form.Basic how to reset fields when trackResetOnLoad true?
body: <p>I got a <code>Ext.form.Basic</code> with the <a href="http://docs.sencha.com/ext-js/4-1/#!/api/Ext.form.Basic-cfg-trackResetOnLoad" rel="noreferrer"><code>trackResetOnLoad</code></a><code>:true</code> config.</p>
  
  <p>When I call <code>reset()</code> on a field it gets its values from the form <code>setValues()</code> method.<br>
  <em>How do I reset my fields now?</em><br>
  When I just do <code>field.setValue('')</code> the form marks it as invalid because the field is required.</p>
  
  <p>Thanks in advance.</p>