#include <QtGui>

class MyMainWindow : public QMainWindow
{
   Q_OBJECT
   
public:
   MyMainWindow() : QMainWindow() {}

public slots:
   void openDialog();
};

void MyMainWindow::openDialog()
{
   QDialog* childWindow = new QDialog();
   QVBoxLayout* l = new QVBoxLayout();
   childWindow->setLayout(l);
   QPushButton* button = new QPushButton("Close", childWindow);
   connect(button, SIGNAL(clicked(bool)), childWindow, SLOT(close()));
   l->addWidget(button);
   childWindow->show();
}

int main(int argc, char* argv[])
{
   QApplication app(argc, argv);
   MyMainWindow* mainWindow = new MyMainWindow();
   QMenu* fileMenu = mainWindow->menuBar()->addMenu("File");
   fileMenu->addAction("Open Dialog", mainWindow, SLOT(openDialog()));
   mainWindow->show();
   app.exec();
}

#include "menuBarTest.moc"