QHBoxLayout layout new QHBoxLayout QWidget cWidget new QWidget cWidget

QHBoxLayout *layout = new QHBoxLayout();
    QWidget *cWidget = new QWidget();
    cWidget->setLayout(layout);

    QVBoxLayout *leftPanel = new QVBoxLayout();
    QHBoxLayout *buttonsPanel = new QHBoxLayout();

    QListView *lw_Main = new QListView();
    lw_Main->setFixedWidth(200);
    lw_Main->setGeometry(0, 0, 200, 120);

    QPushButton *pb_New = new QPushButton();
    pb_New->setText("Добавить");
    pb_New->setFixedHeight(25);

    QPushButton *pb_Remove = new QPushButton();
    pb_Remove->setText("Удалить");
    pb_Remove->setFixedHeight(25);

    QPushButton *pb_Back = new QPushButton();
    pb_Back->setText("Назад к списку");
    pb_Back->setFixedHeight(25);
    pb_Back->setVisible(false);

    QWebView *browser = new QWebView();

    leftPanel->addWidget(lw_Main);
    buttonsPanel->addWidget(pb_New);
    buttonsPanel->addWidget(pb_Remove);
    buttonsPanel->addWidget(pb_Back);
    leftPanel->addLayout(buttonsPanel);
    layout->addLayout(leftPanel);
    layout->addWidget(browser);
    w.setCentralWidget(cWidget);
    w.setMinimumSize(500, 120);