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RnD to add to maya windows menu on startup

global proc rebuildMenusList()
{
    global string $gMainWindow;
    // These are the main common menus which are shown only in the common menuSet
    string $commonMenus[] = {
        // These are menus that appear in menu bar by default
        "mainFileMenu",
        "mainEditMenu",
        "mainModifyMenu",
        "mainCreateMenu",
        "mainDisplayMenu",
        "mainWindowMenu"
    };
    // This is a list of menus that will not appear in All Menus list
    string $filterMenus[] = {
        // These are menus that appear in menu bar by default
        "mainFileMenu",
        "mainEditMenu",
        "mainModifyMenu",
        "mainCreateMenu",
        "mainDisplayMenu",
        "mainWindowMenu",
        // These help/test/bonustools menus are always shown at the end
        "HelpMenu",
        "MainHelpMenu",
        "bonusToolsMenu",
        "repoTestMenu", 
        // These are Hotbox menus
        "HotboxNorth1", "HotboxNorth2", "HotboxNorth3", 
        "HotboxSouth1", "HotboxSouth2", "HotboxSouth3", 
        "HotboxEast1", "HotboxEast2", "HotboxEast3", 
        "HotboxWest1", "HotboxWest2", "HotboxWest3", 
        "HotboxCenter1", "HotboxCenter2", "HotboxCenter3",
        "HotBoxRecentCommandsMenu", 
        "HotBoxControlsMenu"
    };
    ...

this is all build in global proc buildDeferredMenus in initMainMenuBar.mel
however running this just crashes Maya with error:
Object 'mainFileMenu' not found. and Object 'mainWindowMenu' not found.

// Description:
//   This proc is provided so that users can choose to immediately build the main menus 
//   that we now defer building for desktop heap memory reasons (as of Maya2009)
//   (see bug 305296). It is not called by Maya on startup.  
//
global proc buildDeferredMenus()
{
    // File Menu
    buildFileMenu();

    // Edit Menu
    global string $gMainEditMenu;
    string $editMenu = "MayaWindow|" + $gMainEditMenu;

    buildEditMenu( $editMenu );

    // Window Menu
    global string $gMainWindowMenu;

    buildViewMenu ( $gMainWindowMenu );

    // Help Menu
    buildHelpMenu();
}

custom version

        global string $gMainFileMenu    = "mainFileMenu";
        global string $gMainEditMenu    = "mainEditMenu";
        global string $gMainModifyMenu  = "mainModifyMenu";
        global string $gMainDisplayMenu = "mainDisplayMenu";
        global string $gMainWindowMenu  = "mainWindowMenu";
        global string $gMainCreateMenu  = "mainCreateMenu";
        global string $gMainSelectMenu  = "mainSelectMenu";


global proc buildDeferredMenus()
{
    // File Menu
    buildFileMenu();

    // Edit Menu
    global string $gMainEditMenu;
    string $editMenu = "MayaWindow|" + $gMainEditMenu;

    buildEditMenu( $editMenu );

    // Window Menu
    buildViewMenu ( "mainWindowMenu" );

    // Help Menu
    buildHelpMenu();
}


```python
mel.eval("evalDeferred buildFileMenu")

mel.eval('evalDeferred "source ViewMenu;"')
leads to Object 'mainFileMenu' not found.
`

use whatIs buildFileMenu prints
C:/Program Files/Autodesk/Maya2024/scripts/startup/FileMenu.mel

maybe we can use this

menu -e -postMenuCommand checkMainFileMenu $gMainFileMenu;

got it to work
[[demo code to add to maya windows menu on startup]]

but am interested in [[Maya runTimeCommand from menu]]
since defaultRunTimeCommands.mel in startup uses them:

runTimeCommand -default true
    -label      (uiRes("m_defaultRunTimeCommands.kShelfEditorLbl")) 
    -annotation (uiRes("m_defaultRunTimeCommands.kShelfEditorAnnot"))
    -category   ("Menu items.Common.Windows.Settings/Preferences")
    -command    ("shelfEditorDialog")
    ShelfPreferencesWindow;