QGraphicsProxyWidget does not show children on Symbian

#include <QtGui/QWidget>
#include <QGraphicsView>
#include <QGraphicsProxyWidget>
#include <QApplication>
#include <QPushButton>

class MyWidget : public QGraphicsView
{
    Q_OBJECT

public:
    MyWidget(QWidget *parent = 0);
    ~MyWidget();

private:
    QGraphicsProxyWidget *m_pGraphicsProxyWidget;
};

MyWidget::MyWidget(QWidget *parent)
    : QGraphicsView(parent)
{
    QGraphicsScene *pScene = new QGraphicsScene(this);
    setScene(pScene);
	
    QWidget *container = new QWidget(0);
    container->setGeometry(0, 0, 200, 158);
	
    QPalette pal = container->palette();
    pal.setColor(QPalette::Window, Qt::white);
    pal.setColor(QPalette::WindowText, Qt::black);
    container->setPalette(pal);


    QPushButton *getMeHereButton = new QPushButton("Get me here", container);
    getMeHereButton->setGeometry(0, 0, 200, 50);
    
    QPushButton *addToMyPlacesButton = new QPushButton("Add to My Places", container);
    addToMyPlacesButton->setGeometry(0, 54, 200, 50);

    QPushButton *avoidThisAreaButton = new QPushButton("Avoid this area", container);
    avoidThisAreaButton->setGeometry(0, 108, 200, 50);
    
    m_pGraphicsProxyWidget = scene()->addWidget(container);
}

MyWidget::~MyWidget()
{

}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyWidget w;
    w.show();
    return a.exec();
}