code: func RadioButtonNew(group *glib.SList) (*RadioButton, error) {
  	c := C.gtk_radio_button_new(cGSList(group))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapRadioButton(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // RadioButtonNew is a wrapper around gtk_radio_button_new().