Window menu problem, C# & Qt

I’ve wasted 2 days trying to figure out why one class (UI designed in Qt Creator and then converted to C#) shows the menu and the other (written by hand, mostly copy&paste from the Qt-converted one) doesn’t show the menu. Maybe a pair of fresh eyes can see what’s wrong? It drives me nuts. Here are the codes:

Made in Qt Creator:


public class MainWindow : QMainWindow{
		
	    public QAction actionNew;
	    public QAction actionOpen;
	    public QAction actionSave;
	    public QAction actionSaveAs;
	    public QAction actionQuit;
	    public QAction actionConfigGiraffe;
	    public QAction actionConvert;
	    public QAction actionRestart;
	    public QAction actionAbout;
		
		public QWidget mainWidget;
		public QWidget menuWidget;
		public QWidget toolWidget;
		public QWidget statusWidget;
		public QStackedWidget stackWidget;
	    public QWidget startPage;
	    public QWidget basicVideoPage;
	    public QWidget basicAudioPage;
	    public QWidget basicImagePage;
		
	    public QVBoxLayout mainLayout;
	    public QSpacerItem hSpacer;
	    public QSpacerItem vSpacer;
	    public QSize size;	

		public QMenuBar menuBar;
	    public QMenu menuFile;
	    public QMenu menuEdit;
	    public QMenu menuView;
	    public QMenu menuGo;
	    public QMenu menuTools;
	    public QMenu menuSettings;
	    public QMenu menuHelp;
	    public QStatusBar statusBar;
	    public QToolBar toolBar;

		startWin.StartWindow startwin = new startWin.StartWindow();
		//Ui.MainWindow win = new Ui.MainWindow();
				
		public MainWindow() {
			InitUI();
			//win.SetupUi(this);
			this.Show();
		}
		
		public void InitUI() {
			this.WindowTitle = "Start - Cute Giraffe";
			size = new QSize(500, 400);
			this.Size = size;
			this.Move(200,200);
			hSpacer = new QSpacerItem(50, 20, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding);
			vSpacer = new QSpacerItem(20, 100, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding);
			mainWidget = new QWidget(this);
			//menuWidget = new QWidget(mainWidget);
			//toolWidget = new QWidget(mainWidget);
			//statusWidget = new QWidget(mainWidget);
			stackWidget = new QStackedWidget(mainWidget);
		    startPage = new QWidget(stackWidget);
		    basicVideoPage = new QWidget(stackWidget);
		    basicAudioPage = new QWidget(stackWidget);
		    basicImagePage = new QWidget(stackWidget);
			
			startwin.StartUI(this, startPage);
			
			stackWidget.AddWidget(startPage);
			stackWidget.AddWidget(basicVideoPage);
			stackWidget.AddWidget(basicAudioPage);
			stackWidget.AddWidget(basicImagePage);
			stackWidget.SetCurrentIndex(0);
			
			mainLayout = new QVBoxLayout(mainWidget);
			//mainLayout.AddWidget(menuWidget);
			//mainLayout.AddWidget(toolWidget);
			mainLayout.AddItem(vSpacer);
			mainLayout.AddWidget(stackWidget);
			mainLayout.AddItem(vSpacer);
			//mainLayout.AddWidget(statusWidget);
			mainLayout.sizeConstraint = QLayout.SizeConstraint.SetDefaultConstraint;
			
			mainWidget.SetLayout(mainLayout);
			this.SetCentralWidget(mainWidget);
			
		    actionNew = new QAction("&New", this);
		    actionOpen = new QAction("&Open", this);
		    actionSave = new QAction("&Save", this);
		    actionSaveAs = new QAction("Save &As...", this);
		    actionQuit = new QAction("&Quit", this);
		    actionConfigGiraffe = new QAction("Configure &Giraffe...", this);
		    actionConvert = new QAction("&Convert", this);
		    actionRestart = new QAction("&Restart", this);
		    actionAbout = new QAction("&About", this);
		
		    menuBar = new QMenuBar(this);
			menuBar.Geometry = new QRect(0, 0, 500, 22);
			menuFile = new QMenu(menuBar);
			menuEdit = new QMenu(menuBar);
			menuView = new QMenu(menuBar);
			menuGo = new QMenu(menuBar);
			menuTools = new QMenu(menuBar);
			menuSettings = new QMenu(menuBar);
			menuHelp = new QMenu(menuBar);
/*		    menuFile.AddAction(actionNew);
		    menuFile.AddAction(actionOpen);
		    menuFile.AddAction(actionSave);
		    menuFile.AddAction(actionSaveAs);
		    menuFile.AddSeparator();
		    menuFile.AddAction(actionQuit);
*/		    this.SetMenuBar(menuBar);
			
			menuBar.AddAction(menuFile.MenuAction());
			menuBar.AddAction(menuEdit.MenuAction());
			menuBar.AddAction(menuView.MenuAction());
			menuBar.AddAction(menuGo.MenuAction());
			menuBar.AddAction(menuTools.MenuAction());
			menuBar.AddAction(menuSettings.MenuAction());
			menuBar.AddAction(menuHelp.MenuAction());
			menuFile.AddAction(actionNew);
			menuFile.AddAction(actionOpen);
			menuFile.AddAction(actionSave);
			menuFile.AddAction(actionSaveAs);
			menuFile.AddSeparator();
			menuFile.AddAction(actionQuit);
			menuHelp.AddAction(actionAbout);
			
/*		    menuEdit = new QMenu();
			menuEdit = MenuBar().AddMenu("&Edit");
		    menuView = new QMenu();
			menuView = MenuBar().AddMenu("&View");
		    menuGo = new QMenu();
			menuGo = MenuBar().AddMenu("&Go");
		    menuTools = new QMenu();
			menuTools = MenuBar().AddMenu("&Tools");
		    menuSettings = new QMenu();
			menuSettings = MenuBar().AddMenu("&Settings");
		    menuHelp = new QMenu();
			menuHelp = MenuBar().AddMenu("&Help");
		    menuHelp.AddAction(actionAbout);
*/			
		    toolBar = new QToolBar(this);
		    toolBar.AddAction(actionQuit);
		    this.AddToolBar(Qt.ToolBarArea.TopToolBarArea, toolBar);

		    statusBar = new QStatusBar(this);
		    this.SetStatusBar(statusBar);

Hand written:


public class Ui_MainWindow
{
    public QAction actionQuit;
    public QAction actionNew;
    public QAction actionOpen;
    public QAction actionSave;
    public QAction actionSave_As;
    public QAction actionConfigure_Giraffe;
    public QAction actionConvert;
    public QAction actionRestart;
    public QAction actionAbout;
    public QWidget centralWidget;
    public QHBoxLayout hboxLayout;
    public QMenuBar menuBar;
    public QMenu menuEdit;
    public QMenu menuView;
    public QMenu menuGo;
    public QMenu menuTools;
    public QMenu menuSettings;
    public QMenu menuHelp;
    public QMenu menuFile;
    public QStatusBar statusBar;
    public QToolBar toolBar;

    public void SetupUi(QMainWindow MainWindow)
    {
    if (MainWindow.ObjectName == "")
        MainWindow.ObjectName = "MainWindow";
    QSize Size = new QSize(500, 400);
    Size = Size.ExpandedTo(MainWindow.MinimumSizeHint());
    MainWindow.Size = Size;
    actionQuit = new QAction(MainWindow);
    actionQuit.ObjectName = "actionQuit";
    actionNew = new QAction(MainWindow);
    actionNew.ObjectName = "actionNew";
    actionOpen = new QAction(MainWindow);
    actionOpen.ObjectName = "actionOpen";
    actionSave = new QAction(MainWindow);
    actionSave.ObjectName = "actionSave";
    actionSave_As = new QAction(MainWindow);
    actionSave_As.ObjectName = "actionSave_As";
    actionConfigure_Giraffe = new QAction(MainWindow);
    actionConfigure_Giraffe.ObjectName = "actionConfigure_Giraffe";
    actionConvert = new QAction(MainWindow);
    actionConvert.ObjectName = "actionConvert";
    actionRestart = new QAction(MainWindow);
    actionRestart.ObjectName = "actionRestart";
    actionAbout = new QAction(MainWindow);
    actionAbout.ObjectName = "actionAbout";
    centralWidget = new QWidget(MainWindow);
    centralWidget.ObjectName = "centralWidget";
    hboxLayout = new QHBoxLayout(centralWidget);
    hboxLayout.Spacing = 6;
    hboxLayout.Margin = 11;
    hboxLayout.ObjectName = "hboxLayout";
    MainWindow.SetCentralWidget(centralWidget);
    menuBar = new QMenuBar(MainWindow);
    menuBar.ObjectName = "menuBar";
    menuBar.Enabled = true;
    menuBar.Geometry = new QRect(0, 0, 500, 22);
    menuEdit = new QMenu(menuBar);
    menuEdit.ObjectName = "menuEdit";
    menuView = new QMenu(menuBar);
    menuView.ObjectName = "menuView";
    menuGo = new QMenu(menuBar);
    menuGo.ObjectName = "menuGo";
    menuTools = new QMenu(menuBar);
    menuTools.ObjectName = "menuTools";
    menuSettings = new QMenu(menuBar);
    menuSettings.ObjectName = "menuSettings";
    menuHelp = new QMenu(menuBar);
    menuHelp.ObjectName = "menuHelp";
    menuFile = new QMenu(menuBar);
    menuFile.ObjectName = "menuFile";
    MainWindow.SetMenuBar(menuBar);
    statusBar = new QStatusBar(MainWindow);
    statusBar.ObjectName = "statusBar";
    MainWindow.SetStatusBar(statusBar);
    toolBar = new QToolBar(MainWindow);
    toolBar.ObjectName = "toolBar";
    MainWindow.AddToolBar(Qt.ToolBarArea.TopToolBarArea, toolBar);

    menuBar.AddAction(menuFile.MenuAction());
    menuBar.AddAction(menuEdit.MenuAction());
    menuBar.AddAction(menuView.MenuAction());
    menuBar.AddAction(menuGo.MenuAction());
    menuBar.AddAction(menuTools.MenuAction());
    menuBar.AddAction(menuSettings.MenuAction());
    menuBar.AddAction(menuHelp.MenuAction());
    menuHelp.AddAction(actionAbout);
    menuFile.AddAction(actionNew);
    menuFile.AddAction(actionOpen);
    menuFile.AddAction(actionSave);
    menuFile.AddAction(actionSave_As);
    menuFile.AddSeparator();
    menuFile.AddAction(actionQuit);
    toolBar.AddAction(actionQuit);