Creating a Symbian's like Application Menu

Hello, I wanted to make an app which is when started it shows a menu. It is just like when you open a Messaging app in S60. Here is a screenshot http://bit.ly/jVDiXo.

How do I make it? I have tried to make the centralWidget of the QMainWindow as QMenu, and adding QAction to the QMenu. But when I'm running it, the app don't show anything. And I have tried to make the QMenu using QMenuBar. And it is show okay. But I can't use the up/down key to select menu in the device. And when I press the options key (Qt::PositiveSoftKey), the menubar shows up too. And I didn't even add that to menuBar() which is owned by QMainWindow.

Here is my first code:
Code:

QAction* act1= new QAction(tr("act1"),this); QObject::connect(tes,SIGNAL(triggered()),this,SLOT(close())); QAction* act2= new QAction(tr("act2"),this); QObject::connect(tes,SIGNAL(triggered()),this,SLOT(close())); QMenu* menu = new QMenu(this); menu->addAction(act1); menu->addAction(act2); setCentralWidget(menu);
It shows nothing at the apps.

And here is my second try:
Code:

QAction* act1= new QAction(tr("act1"),this); QObject::connect(tes,SIGNAL(triggered()),this,SLOT(close())); QAction* act2= new QAction(tr("act2"),this); QObject::connect(tes,SIGNAL(triggered()),this,SLOT(close())); QMenuBar* menubar = new QMenuBar(this); QMenu* menu = menubar->addMenu(tr("menu")); menu->addAction(act1); menu->addAction(act2); setCentralWidget(menu);
It shows the menu. But when I deploy to the device, I can't use the keypad to select the menu. And at the simulator, if I click other place than the QAction item, the menu lost.

What is the correct way to do this? Or is my way correct? What should I do next then?