Gtk.RadioButton.new_with_mnemonic

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

Creates a new Gtk.RadioButton containing a label, adding it to the same group as group. The label will be created using Gtk.Label.new_with_mnemonic, so underscores in label indicate the mnemonic for the button.