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:
Qt Code: 
  1. public class MainWindow : QMainWindow{
  2.  
  3. 	    public QAction actionNew;
  4. 	    public QAction actionOpen;
  5. 	    public QAction actionSave;
  6. 	    public QAction actionSaveAs;
  7. 	    public QAction actionQuit;
  8. 	    public QAction actionConfigGiraffe;
  9. 	    public QAction actionConvert;
  10. 	    public QAction actionRestart;
  11. 	    public QAction actionAbout;
  12.  
  13. 		public QWidget mainWidget;
  14. 		public QWidget menuWidget;
  15. 		public QWidget toolWidget;
  16. 		public QWidget statusWidget;
  17. 		public QStackedWidget stackWidget;
  18. 	    public QWidget startPage;
  19. 	    public QWidget basicVideoPage;
  20. 	    public QWidget basicAudioPage;
  21. 	    public QWidget basicImagePage;
  22.  
  23. 	    public QVBoxLayout mainLayout;
  24. 	    public QSpacerItem hSpacer;
  25. 	    public QSpacerItem vSpacer;
  26. 	    public QSize size;	
  27.  
  28. 		public QMenuBar menuBar;
  29. 	    public QMenu menuFile;
  30. 	    public QMenu menuEdit;
  31. 	    public QMenu menuView;
  32. 	    public QMenu menuGo;
  33. 	    public QMenu menuTools;
  34. 	    public QMenu menuSettings;
  35. 	    public QMenu menuHelp;
  36. 	    public QStatusBar statusBar;
  37. 	    public QToolBar toolBar;
  38.  
  39. 		startWin.StartWindow startwin = new startWin.StartWindow();
  40. 		//Ui.MainWindow win = new Ui.MainWindow();
  41.  
  42. 		public MainWindow() {
  43. 			InitUI();
  44. 			//win.SetupUi(this);
  45. 			this.Show();
  46. 		}
  47.  
  48. 		public void InitUI() {
  49. 			this.WindowTitle = "Start - Cute Giraffe";
  50. 			size = new QSize(500, 400);
  51. 			this.Size = size;
  52. 			this.Move(200,200);
  53. 			hSpacer = new QSpacerItem(50, 20, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding);
  54. 			vSpacer = new QSpacerItem(20, 100, QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding);
  55. 			mainWidget = new QWidget(this);
  56. 			//menuWidget = new QWidget(mainWidget);
  57. 			//toolWidget = new QWidget(mainWidget);
  58. 			//statusWidget = new QWidget(mainWidget);
  59. 			stackWidget = new QStackedWidget(mainWidget);
  60. 		    startPage = new QWidget(stackWidget);
  61. 		    basicVideoPage = new QWidget(stackWidget);
  62. 		    basicAudioPage = new QWidget(stackWidget);
  63. 		    basicImagePage = new QWidget(stackWidget);
  64.  
  65. 			startwin.StartUI(this, startPage);
  66.  
  67. 			stackWidget.AddWidget(startPage);
  68. 			stackWidget.AddWidget(basicVideoPage);
  69. 			stackWidget.AddWidget(basicAudioPage);
  70. 			stackWidget.AddWidget(basicImagePage);
  71. 			stackWidget.SetCurrentIndex(0);
  72.  
  73. 			mainLayout = new QVBoxLayout(mainWidget);
  74. 			//mainLayout.AddWidget(menuWidget);
  75. 			//mainLayout.AddWidget(toolWidget);
  76. 			mainLayout.AddItem(vSpacer);
  77. 			mainLayout.AddWidget(stackWidget);
  78. 			mainLayout.AddItem(vSpacer);
  79. 			//mainLayout.AddWidget(statusWidget);
  80. 			mainLayout.sizeConstraint = QLayout.SizeConstraint.SetDefaultConstraint;
  81.  
  82. 			mainWidget.SetLayout(mainLayout);
  83. 			this.SetCentralWidget(mainWidget);
  84.  
  85. 		    actionNew = new QAction("&New", this);
  86. 		    actionOpen = new QAction("&Open", this);
  87. 		    actionSave = new QAction("&Save", this);
  88. 		    actionSaveAs = new QAction("Save &As...", this);
  89. 		    actionQuit = new QAction("&Quit", this);
  90. 		    actionConfigGiraffe = new QAction("Configure &Giraffe...", this);
  91. 		    actionConvert = new QAction("&Convert", this);
  92. 		    actionRestart = new QAction("&Restart", this);
  93. 		    actionAbout = new QAction("&About", this);
  94.  
  95. 		    menuBar = new QMenuBar(this);
  96. 			menuBar.Geometry = new QRect(0, 0, 500, 22);
  97. 			menuFile = new QMenu(menuBar);
  98. 			menuEdit = new QMenu(menuBar);
  99. 			menuView = new QMenu(menuBar);
  100. 			menuGo = new QMenu(menuBar);
  101. 			menuTools = new QMenu(menuBar);
  102. 			menuSettings = new QMenu(menuBar);
  103. 			menuHelp = new QMenu(menuBar);
  104. /*		    menuFile.AddAction(actionNew);
  105. 		    menuFile.AddAction(actionOpen);
  106. 		    menuFile.AddAction(actionSave);
  107. 		    menuFile.AddAction(actionSaveAs);
  108. 		    menuFile.AddSeparator();
  109. 		    menuFile.AddAction(actionQuit);
  110. */		    this.SetMenuBar(menuBar);
  111.  
  112. 			menuBar.AddAction(menuFile.MenuAction());
  113. 			menuBar.AddAction(menuEdit.MenuAction());
  114. 			menuBar.AddAction(menuView.MenuAction());
  115. 			menuBar.AddAction(menuGo.MenuAction());
  116. 			menuBar.AddAction(menuTools.MenuAction());
  117. 			menuBar.AddAction(menuSettings.MenuAction());
  118. 			menuBar.AddAction(menuHelp.MenuAction());
  119. 			menuFile.AddAction(actionNew);
  120. 			menuFile.AddAction(actionOpen);
  121. 			menuFile.AddAction(actionSave);
  122. 			menuFile.AddAction(actionSaveAs);
  123. 			menuFile.AddSeparator();
  124. 			menuFile.AddAction(actionQuit);
  125. 			menuHelp.AddAction(actionAbout);
  126.  
  127. /*		    menuEdit = new QMenu();
  128. 			menuEdit = MenuBar().AddMenu("&Edit");
  129. 		    menuView = new QMenu();
  130. 			menuView = MenuBar().AddMenu("&View");
  131. 		    menuGo = new QMenu();
  132. 			menuGo = MenuBar().AddMenu("&Go");
  133. 		    menuTools = new QMenu();
  134. 			menuTools = MenuBar().AddMenu("&Tools");
  135. 		    menuSettings = new QMenu();
  136. 			menuSettings = MenuBar().AddMenu("&Settings");
  137. 		    menuHelp = new QMenu();
  138. 			menuHelp = MenuBar().AddMenu("&Help");
  139. 		    menuHelp.AddAction(actionAbout);
  140. */			
  141. 		    toolBar = new QToolBar(this);
  142. 		    toolBar.AddAction(actionQuit);
  143. 		    this.AddToolBar(Qt.ToolBarArea.TopToolBarArea, toolBar);
  144.  
  145. 		    statusBar = new QStatusBar(this);
  146. 		    this.SetStatusBar(statusBar);
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Hand written:
Qt Code: 
  1. public class Ui_MainWindow
  2. {
  3.     public QAction actionQuit;
  4.     public QAction actionNew;
  5.     public QAction actionOpen;
  6.     public QAction actionSave;
  7.     public QAction actionSave_As;
  8.     public QAction actionConfigure_Giraffe;
  9.     public QAction actionConvert;
  10.     public QAction actionRestart;
  11.     public QAction actionAbout;
  12.     public QWidget centralWidget;
  13.     public QHBoxLayout hboxLayout;
  14.     public QMenuBar menuBar;
  15.     public QMenu menuEdit;
  16.     public QMenu menuView;
  17.     public QMenu menuGo;
  18.     public QMenu menuTools;
  19.     public QMenu menuSettings;
  20.     public QMenu menuHelp;
  21.     public QMenu menuFile;
  22.     public QStatusBar statusBar;
  23.     public QToolBar toolBar;
  24.  
  25.     public void SetupUi(QMainWindow MainWindow)
  26.     {
  27.     if (MainWindow.ObjectName == "")
  28.         MainWindow.ObjectName = "MainWindow";
  29.     QSize Size = new QSize(500, 400);
  30.     Size = Size.ExpandedTo(MainWindow.MinimumSizeHint());
  31.     MainWindow.Size = Size;
  32.     actionQuit = new QAction(MainWindow);
  33.     actionQuit.ObjectName = "actionQuit";
  34.     actionNew = new QAction(MainWindow);
  35.     actionNew.ObjectName = "actionNew";
  36.     actionOpen = new QAction(MainWindow);
  37.     actionOpen.ObjectName = "actionOpen";
  38.     actionSave = new QAction(MainWindow);
  39.     actionSave.ObjectName = "actionSave";
  40.     actionSave_As = new QAction(MainWindow);
  41.     actionSave_As.ObjectName = "actionSave_As";
  42.     actionConfigure_Giraffe = new QAction(MainWindow);
  43.     actionConfigure_Giraffe.ObjectName = "actionConfigure_Giraffe";
  44.     actionConvert = new QAction(MainWindow);
  45.     actionConvert.ObjectName = "actionConvert";
  46.     actionRestart = new QAction(MainWindow);
  47.     actionRestart.ObjectName = "actionRestart";
  48.     actionAbout = new QAction(MainWindow);
  49.     actionAbout.ObjectName = "actionAbout";
  50.     centralWidget = new QWidget(MainWindow);
  51.     centralWidget.ObjectName = "centralWidget";
  52.     hboxLayout = new QHBoxLayout(centralWidget);
  53.     hboxLayout.Spacing = 6;
  54.     hboxLayout.Margin = 11;
  55.     hboxLayout.ObjectName = "hboxLayout";
  56.     MainWindow.SetCentralWidget(centralWidget);
  57.     menuBar = new QMenuBar(MainWindow);
  58.     menuBar.ObjectName = "menuBar";
  59.     menuBar.Enabled = true;
  60.     menuBar.Geometry = new QRect(0, 0, 500, 22);
  61.     menuEdit = new QMenu(menuBar);
  62.     menuEdit.ObjectName = "menuEdit";
  63.     menuView = new QMenu(menuBar);
  64.     menuView.ObjectName = "menuView";
  65.     menuGo = new QMenu(menuBar);
  66.     menuGo.ObjectName = "menuGo";
  67.     menuTools = new QMenu(menuBar);
  68.     menuTools.ObjectName = "menuTools";
  69.     menuSettings = new QMenu(menuBar);
  70.     menuSettings.ObjectName = "menuSettings";
  71.     menuHelp = new QMenu(menuBar);
  72.     menuHelp.ObjectName = "menuHelp";
  73.     menuFile = new QMenu(menuBar);
  74.     menuFile.ObjectName = "menuFile";
  75.     MainWindow.SetMenuBar(menuBar);
  76.     statusBar = new QStatusBar(MainWindow);
  77.     statusBar.ObjectName = "statusBar";
  78.     MainWindow.SetStatusBar(statusBar);
  79.     toolBar = new QToolBar(MainWindow);
  80.     toolBar.ObjectName = "toolBar";
  81.     MainWindow.AddToolBar(Qt.ToolBarArea.TopToolBarArea, toolBar);
  82.  
  83.     menuBar.AddAction(menuFile.MenuAction());
  84.     menuBar.AddAction(menuEdit.MenuAction());
  85.     menuBar.AddAction(menuView.MenuAction());
  86.     menuBar.AddAction(menuGo.MenuAction());
  87.     menuBar.AddAction(menuTools.MenuAction());
  88.     menuBar.AddAction(menuSettings.MenuAction());
  89.     menuBar.AddAction(menuHelp.MenuAction());
  90.     menuHelp.AddAction(actionAbout);
  91.     menuFile.AddAction(actionNew);
  92.     menuFile.AddAction(actionOpen);
  93.     menuFile.AddAction(actionSave);
  94.     menuFile.AddAction(actionSave_As);
  95.     menuFile.AddSeparator();
  96.     menuFile.AddAction(actionQuit);
  97.     toolBar.AddAction(actionQuit);
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