title: ExtJS 4.2 Grid Form Binding (updaterecord on form edit)
body: <p>I have a grid that on selection binds the record to a form.</p>
  
  <pre><code>gridSelectionChange: function (model, records) {
  
          if (records[0]) {
              this.getFormdata().getForm().loadRecord(records[0]);
          }
      },
  </code></pre>
  
  <p>Everything works fine, but if I change any field value the grid is not updating the record and neither the datastore.</p>
  
  <p>I have read that I have to call:</p>
  
  <pre><code>form.updateRecord();
  </code></pre>
  
  <p>But how can I call it on every lost of focus of my fields (textfield, combos, etc.)?</p>
  
  <p>Is there a way to do the two way binding?</p>