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A menu-item<%> object is an element within a menu%,
 popup-menu%, or menu-bar%. Operations that affect
 the parent —
A menu item is either a separator-menu-item% object (merely a separator), or a labelled-menu-item<%> object; the latter is more specifically an instance of either menu-item% (a plain menu item), checkable-menu-item% (a checkable menu item), or menu% (a submenu).
Removes the item from its parent. If the menu item is already deleted,
delete has no effect.
See also restore.
method
(send a-menu-item get-parent)
→ (or/c (is-a?/c menu%) (is-a?/c popup-menu%) (is-a?/c menu-bar%)) 
Returns the menu, popup menu, or menu bar containing the item. The
 parent for a menu item is specified when the menu item is created,
 and it cannot be changed.
method
(send a-menu-item is-deleted?) → boolean?
Returns #t if the menu item is deleted from its parent,
 #f otherwise.
Adds a deleted item back into its parent. The item is always restored
 to the end of the parent, regardless of its original position. If the
 item is not currently deleted, restore has no
 effect.