Gtk.RadioMenuItem.new_with_mnemonic

function new_with_mnemonic(group:[Gtk.RadioMenuItem], label:String):Gtk.Widget {
    // Gjs wrapper for gtk_radio_menu_item_new_with_mnemonic()
}

Creates a new Gtk.RadioMenuItem containing a label. The label will be created using Gtk.Label.new_with_mnemonic, so underscores in label indicate the mnemonic for the menu item.

group: group the radio menu item is inside
label: the text of the button, with an underscore in front of the mnemonic character
Returns: a new Gtk.RadioMenuItem