see the below code which dll is add for "Bentley.Microstation.Application.MenuBar.GetApplicationMenuBar()"
Bentley.MicroStation.Application.MenuBar appMenu = Bentley.Microstation.Application.MenuBar.GetApplicationMenuBar();
Bentley.Microstation.Application.PullDownMenu pdMenu = (Bentley.Microstation.Application.Pulldown)appMenu.Menu.get_Item(appMenu.Menus.Count - 1);
appMenu.InsertPullDownMenu(pdMenu);
pdMenu = (Bentley.Microstation.Application.PullDownMenu)appMenus.get_Item(appMenu.Menus.Count - 2);
pdMenu.Label = "MyMenu";
MenuItem itm = pdMenu.AppentItem();
itm.Label = "command1";
itm.Enabler = true;
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