title: How to set Ext.Form dirty state?
body: <p>How to change the state <code>dirty</code> of a form to <code>false</code>?</p>
  
  <p>Is there something like <code>setDirty(false)</code> method of <code>Ext.Form.Panel</code>?</p>
  
  <p><strong>UPD:</strong></p>
  
  <p>My task is to track <code>Form</code> dirty state for enabling docked SAVE button to become enabled only if there are any changes in the form.</p>
  
  <p>I'm tracking <code>dirtychange</code> event with:</p>
  
  <pre><code>init: function() {
      this.control({
          'form': {
              dirtychange: function(form) {
                  alert('change');      
              }
          }
      });
  }
  </code></pre>
  
  <p>But when I'm loading a record through <code>loadRecord()</code> method into the Form I'm geting <code>chage</code> alert while loading record and Form becomes dirty after Record was loaded. </p>
  
  <p>I'd like to reset <code>dirty</code> state of a Form right after Record loading and start tracking <code>dirtychange</code> event on record filled form.</p>
  
  <p>Any ideas?</p>