addmenuitem(menuName, itemType, statusHelp = '', traverseSpec = None, **kw)
Add a menu item to the menu menuName. The kind of menu item is given by itemType and may be one of command, separator, checkbutton, radiobutton or cascade (although cascade menus are better added using the addcascademenu() method).
Any keyword arguments present will be passed to the menu when creating the menu item.
See Tkinter.Menu for the valid options for each item type. In addition, a keyboard accelerator may be automatically given to the item, as described under hotkeys. When the mouse is moved over the menu item, the helpString will be displayed by the balloon's statuscommand.