code: func ButtonBoxNew(o Orientation) (*ButtonBox, error) {
  	c := C.gtk_button_box_new(C.GtkOrientation(o))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapButtonBox(obj), nil
  }
docs: // ButtonBoxNew is a wrapper around gtk_button_box_new().