gtk:check-menu-item, gtk:menu-item, gtk:bin, gtk:container, gtk:widget, gtk:buildable, gtk:activatable, gobject:object, common-lisp:standard-object, common-lisp:t

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A radio menu item is a check menu item that belongs to a group. At each instant exactly one of the radio menu items from a group is selected.

The correct way to create a group of radio menu items is approximatively this:

Example: How to create a group of radio menu items.

(let (menu-item last-menu-item)
  ;; Add three menu items to a group
  (dolist (label '("First Menu Item" "Second Menu Item" "Third Menu Item"))
    (setf menu-item (gtk:radio-menu-item-new-with-label nil label))
    (gtk:radio-menu-item-join-group menu-item last-menu-item)
    (setf last-menu-item menu-item)))  

The "group-changed" signal

lambda (radiomenuitem)    :run-first      

radiomenuitem

The gtk:radio-menu-item widget which received the signal.