Closing modal after PM has been send

if ($form_id == 'privatemsg_new') {
  $form['#submit'][] = 'modals_child_form_submit';
  //dvr($form);
}

Here's the snippet i use to close the modal after submit... I use more form_id's in that if, and all work only the privatemsg_new form is giving problems. After the PM has been submitted the whole website load in the modalframe iframe. Any ideas? What more info could i give?