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    QWidget *parentw = new QWidget();

    QWidget *child1 = new QWidget();
    QListWidget *b1 = new QListWidget();
    QListWidget *b2 = new QListWidget();

    QHBoxLayout *hl = new QHBoxLayout();
    hl->addWidget(b1);
    hl->addWidget(b2);
    child1->setLayout(hl);
    child1->show();

    QWidget *child2 = new QWidget(parentw);
    QPushButton *b3 = new QPushButton( "b3" );
    QPushButton *b4 = new QPushButton( "b4" );
    QVBoxLayout *vl = new QVBoxLayout(child2);
    vl->addWidget(b3,0,Qt::AlignHCenter);
    vl->addWidget(b4,0,Qt::AlignHCenter);
    child2->setLayout(vl);

    QStackedLayout *sl = new QStackedLayout();
    sl->addWidget(child1);
    sl->addWidget(child2);
    sl->setStackingMode(QStackedLayout::StackAll);

    parentw->setLayout(sl);
    sl->setCurrentWidget(child2);
    parentw->show();