Added QMenuBar in QDialog it showing but sub menus dosn't open - c++

Question

i added QMenuBar in QDialog using layout that is set in Designer and then manully adding the QMenuBar , when running the application and the QDialog runs i see the QMenuBar with only the menu header without the opening sub menu :
here is my code :
this is the header file generated from the Designer :
QT_BEGIN_NAMESPACE
class Ui_AutoDialog
{
public:
QVBoxLayout *verticalLayout;
QWidget *widget_menuBarHolder;
QVBoxLayout *verticalLayout_2;
QVBoxLayout *verticalLayout_menuBarLayOut;
QWebView *webView;
QWidget *widget;
void setupUi(QDialog *AutoDialog)
{
if (AutoDialog->objectName().isEmpty())
AutoDialog->setObjectName(QString::fromUtf8("AutoDialog"));
AutoDialog->resize(436, 365);
verticalLayout = new QVBoxLayout(AutoDialog);
verticalLayout->setSpacing(0);
verticalLayout->setContentsMargins(0, 0, 0, 0);
verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
widget_menuBarHolder = new QWidget(AutoDialog);
widget_menuBarHolder->setObjectName(QString::fromUtf8("widget_menuBarHolder"));
widget_menuBarHolder->setMinimumSize(QSize(0, 20));
verticalLayout_2 = new QVBoxLayout(widget_menuBarHolder);
verticalLayout_2->setSpacing(0);
verticalLayout_2->setContentsMargins(0, 0, 0, 0);
verticalLayout_2->setObjectName(QString::fromUtf8("verticalLayout_2"));
verticalLayout_menuBarLayOut = new QVBoxLayout();
verticalLayout_menuBarLayOut->setSpacing(0);
verticalLayout_menuBarLayOut->setObjectName(QString::fromUtf8("verticalLayout_menuBarLayOut"));
verticalLayout_2->addLayout(verticalLayout_menuBarLayOut);
verticalLayout->addWidget(widget_menuBarHolder);
webView = new QWebView(AutoDialog);
webView->setObjectName(QString::fromUtf8("webView"));
webView->setUrl(QUrl("about:blank"));
verticalLayout->addWidget(webView);
widget = new QWidget(AutoDialog);
widget->setObjectName(QString::fromUtf8("widget"));
widget->setMinimumSize(QSize(0, 20));
verticalLayout->addWidget(widget);
retranslateUi(AutoDialog);
QMetaObject::connectSlotsByName(AutoDialog);
} // setupUi
void retranslateUi(QDialog *AutoDialog)
{
AutoDialog->setWindowTitle(QApplication::translate("AutoDialog", "Dialog", 0, QApplication::UnicodeUTF8));
} // retranslateUi
};
namespace Ui {
class AutoDialog: public Ui_AutoDialog {};
} // namespace Ui
QT_END_NAMESPACE
and here is the QDialog constructor , the part where is building the QMenuBAr:
ui.setupUi(this);
/*ui.verticalLayout_menuBarLayOut->addWidget(SetMenuBar());
ui.verticalLayout_menuBarLayOut->setMargin(0);
ui.verticalLayout_menuBarLayOut->setSpacing(0);*/
m_actionClose = new QAction(this);
m_actionClose->setObjectName(QString::fromUtf8("actionClose"));
m_actionPreferences = new QAction(this);
m_actionPreferences->setObjectName(QString::fromUtf8("actionPreferences"));
m_menubar = new QMenuBar(this);
m_menubar->setObjectName(QString::fromUtf8("menubar"));
m_menubar->setGeometry(QRect(0, 0, 314, 18));
m_menuFile = new QMenu(m_menubar);
m_menuFile->setObjectName(QString::fromUtf8("menuFile"));
m_menuSettings = new QMenu(m_menubar);
m_menuSettings->setObjectName(QString::fromUtf8("menuSettings"));
m_menubar->setMinimumSize(QSize(0, 20));
ui.verticalLayout_menuBarLayOut->setMenuBar(m_menubar);
m_menubar->addAction(m_menuFile->menuAction());
m_menubar->addAction(m_menuSettings->menuAction());
m_menuFile->addSeparator();
m_menuFile->addAction(m_actionClose);
m_menuSettings->addAction(m_actionPreferences);
m_actionClose->setText(QApplication::translate("MainWindow", "Close", 0, QApplication::UnicodeUTF8));
m_actionPreferences->setText(QApplication::translate("MainWindow", "Preferences", 0, QApplication::UnicodeUTF8));
m_menuFile->setTitle(QApplication::translate("MainWindow", "File", 0, QApplication::UnicodeUTF8));
m_menuSettings->setTitle(QApplication::translate("MainWindow", "Settings", 0, QApplication::UnicodeUTF8));
bar = new QStatusBar(this);
bar->setMinimumSize(QSize(0, 20));
ui.verticalLayout->removeWidget(ui.widget);
ui.verticalLayout->addWidget(bar);
ui.verticalLayout->setMargin(0);
ui.verticalLayout->setSpacing(0);
pb = new QProgressBar(bar);
pb->setTextVisible(false);
pb->hide();
bar->addPermanentWidget(pb);
what is wrong here why i can't see the sub menus.. Close & Preferences?

Answer 1

I'm not familiar with the way you're adding the menus, because I usually add menus to a menubar in a different way.
Try
m_menubar->addMenu( m_menuFile );
m_menubar->addMenu( m_menuSettings );
instead of
m_menubar->addAction(m_menuFile->menuAction());
m_menubar->addAction(m_menuSettings->menuAction());
and let me know if that worked. If not, there must be another problem I will look into.