Qt 4.8.0 (cocoa) It's not possible to add separators in to the application menu

    QMenu *fileMenu = this->menuBar()->addMenu(tr("&File"));

    QAction *open = new QAction(tr("&Open"),fileMenu);
    open->setMenuRole(QAction::ApplicationSpecificRole);

    QAction *save = new QAction(tr("&Save"),fileMenu);
    save->setMenuRole(QAction::ApplicationSpecificRole);

    fileMenu->addAction(open);
    fileMenu->addSeparator()->setMenuRole(QAction::ApplicationSpecificRole);
    fileMenu->addAction(save);