ATTRIB(Button, onClick, void(entity, entity), SUB_Null)
ATTRIB(Button, onClickEntity, entity, NULL)
ATTRIB(Button, src, string, string_null)
ATTRIB(Button, onClick, void(entity, entity), SUB_Null)
ATTRIB(Button, onClickEntity, entity, NULL)
ATTRIB(Button, src, string, string_null)