Are there Menu,Menu Bar and Menu Item components in Qt Design Studio? :(

[Elerence Hooke]

I can use menu, menu bar and menu item components by coding in Qt Design Studio.But I cannot find the corresponding components on the left! Are these components obsolete in components-module of Qt Design Studio?
In addition,although I can use these components by pure coding,I am not able to see the menu and menu item in the preview.Only when I run the project , I can see them entirely.
Sorry that I am not good at English :(