code: func ColorButtonNewWithRGBA(gdkColor *gdk.RGBA) (*ColorButton, error) {
  	c := C.gtk_color_button_new_with_rgba((*C.GdkRGBA)(unsafe.Pointer(gdkColor.Native())))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapColorButton(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // ColorButtonNewWithRGBA is a wrapper around gtk_color_button_new_with_rgba().