Is it possible to put three QDockwidgets side by side?

I have an QMainWindow that has no central widget. Based on suggestions here I've setDockNestingEnable(true) and set the dock widgets to allow Qt::AllDockWidgetAreas. For the most part this is working as desired. However, I'd like to line my dock widgets up 3 across.

i.e.

DockWidgetA DockWidgetB DockWidgetC

Is this possible?

Yes, it's even the default behaviour (at least on Linux). What is the problem?

Code:

---

#include <QtGui>
#include <QDebug>
 
class MainWindow: public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        setGeometry(0, 0, 640, 480);
 
        setDockNestingEnabled(true);
        QDockWidget *dock1 = new QDockWidget(tr("Dock 1"), this);
        dock1->setAllowedAreas(Qt::AllDockWidgetAreas);
        QDockWidget *dock2 = new QDockWidget(tr("Dock 2"), this);
        dock2->setAllowedAreas(Qt::AllDockWidgetAreas);
        QDockWidget *dock3 = new QDockWidget(tr("Dock 3"), this);
        dock3->setAllowedAreas(Qt::AllDockWidgetAreas);
        addDockWidget(Qt::TopDockWidgetArea, dock1);
        addDockWidget(Qt::TopDockWidgetArea, dock2);
        addDockWidget(Qt::TopDockWidgetArea, dock3);
        // No central widget
    }
public slots:
private:
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    MainWindow m;
    m.show();
    return app.exec();
}
#include "main.moc"

---

Thank you,

I missed one of the setAllowedAreas calls.