Stefan Röttger

QAction *quitAction = new QAction(tr("Q&uit"), this);
quitAction->setShortcuts(QKeySequence::Quit);
quitAction->setStatusTip(tr("Quit the application"));
connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));

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

QAction *aboutAction = new QAction(tr("&About"), this);
aboutAction->setShortcut(tr("Ctrl+A"));
aboutAction->setStatusTip(tr("About this program"));
connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));

QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAction);

private slots:

void about()
{
   QMessageBox::about(this, tr("About this program"),
                      tr("just an example"));
}