Ribbon + Docking + MDI(tabview style) work together well example.

QuantumStudio::QuantumStudio(QWidget *parent)
	: QxRibbonWindow(parent)
{
	m_holder = new QWidget(this);

	m_manager = new DockBarManager(m_holder);
	m_panelManager = new DockPanelManager(m_holder);
	m_panelManager->setDockPanelTransparentWhileDragging(true);
	m_panelManager->setArrowMarkersShown(true);
	m_panelManager->setDockPanelFullContentsWhileDraggingShown(true);


	m_mdiArea = new QMdiArea(m_holder);
	m_mdiArea->setLineWidth(3);
	m_mdiArea->setFrameShape(QFrame::Panel);
	m_mdiArea->setFrameShadow(QFrame::Sunken);

	m_mdiArea->setViewMode(QMdiArea::TabbedView);
	qApp->installEventFilter(this);
	setCentralWidget(m_holder);
	m_mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	m_mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	m_panelManager->setCentralWidget(m_mdiArea);
	m_panelManager->centralWidget()->setFocus();

	createQuickAccessBar();
	createDockWindows();
	createBackstage();
	statusBar();

	ribbonBar()->setTitleBackground(QPixmap(":/res/background.png"));

	move(QPoint(200, 200));
	QRect geom = QApplication::desktop()->availableGeometry();
	resize(2 * geom.width() / 3, 2 * geom.height() / 3);

	QSettings settings;
	QStringList files = settings.value("recentFileList").toStringList();
	settings.setValue("recentFileList", files);
	emit updateRecentFileActions(files);
	ribbonBar()->systemButton()->setToolButtonStyle(Qt::ToolButtonTextOnly);
	QListWidget* customerList = new QListWidget();
	customerList->show();
	for (int i = 0; 10 > i; i++)
		customerList->addItems(QStringList(QObject::tr("Item %1").arg(i + 1)));

	m_mdiArea->addSubWindow(customerList);
	customerList = new QListWidget();
	for (int i = 0; 10 > i; i++)
		customerList->addItems(QStringList(QObject::tr("Item %1").arg(i + 1)));

	m_mdiArea->addSubWindow(customerList);
	customerList = new QListWidget();
	for (int i = 0; 10 > i; i++)
		customerList->addItems(QStringList(QObject::tr("Item %1").arg(i + 1)));

	m_mdiArea->addSubWindow(customerList);
	customerList = new QListWidget();
	for (int i = 0; 10 > i; i++)
		customerList->addItems(QStringList(QObject::tr("Item %1").arg(i + 1)));

	m_mdiArea->addSubWindow(customerList);
}