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    QMenu *trayMenu = new QMenu();
    QSystemTrayIcon *trayIcon = new QSystemTrayIcon;

    QAction *actionFirst = new QAction("First",trayIcon);
    QAction *actionSecond = new QAction("Second",trayIcon);
    actionSecond->setEnabled(false);

    QMenu *subMenu = new QMenu("Sub menu");

    QAction *actionSubFirst = new QAction("Sub first",subMenu);
    QAction *actionSubSecond = new QAction("Sub second",subMenu);
    actionSubSecond->setEnabled(false);

    subMenu->addAction(actionSubFirst);
    subMenu->addAction(actionSubSecond);

    trayMenu->addAction(actionFirst);
    trayMenu->addAction(actionSecond);
    trayMenu->addMenu(subMenu);

    trayIcon->setContextMenu(trayMenu);

    QPixmap pxm(16,16);
    pxm.fill(QColor(Qt::red));

    trayIcon->setIcon(QIcon(pxm));
    trayIcon->show();