title: How to know closing event of sub form in parent form
body: <p>I have a main form with :</p>
  <ul>
  <li>a table of data (list of pay)</li>
  <li>a button calling a subform (assistant form to create easily a bound of pay for a complete year)</li>
  </ul>
  <p>After closing the subform, I have to update the main form data (table view) only if the user click Generate (to avoid data update), ie only if the user generate new payroll.</p>
  <p>Is there a way to know if the user cancel or not action in the subform?</p>