function addModal(Window $modal, $recipients)
{
foreach ($recipients as $login) {
if (isset($this->modals[$login]) && !isset($this->modalsRecipients[$modal->getId()][$login])) {
$this->modals[$login][] = $modal;
$this->modalsRecipients[$modal->getId()][$login] = true;
}
}
$modal->addCloseCallback(array($this, 'onModalClosed'));
}
