gtk-radio-menu-item-new-with-mnemonic (group label)

group -- the gtk-radio-menu-item group to which the radio menu item is to be attached
label -- a string with the text of the radio menu item, with an underscore in front of the mnemonic character

A new gtk-radio-menu-item widget.

Creates a new radio menu item containing a label. The label will be created using the function gtk-label-new-with-mnemonic, so underscores in the label indicate the mnemonic for the menu item.