A toggle menu item of which only one in the group may be active.
GObject
`-- GtkObject
`-- GtkWidget
`-- GtkContainer
`-- GtkBin
`-- GtkItem
`-- GtkMenuItem
`-- GtkCheckMenuItem
`-- GtkRadioMenuItem
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.
-- Creates a new radio menu item.
-- Creates a new radio menu item based on an existing one.
get_group() Returns an array of all group members. set_group() Sets the group the item belongs to.
"group-changed" The item is in another group.