I asked this question on the wireshark-dev mailing list and @cmaynard solved it. YOU HAVE HERE:
asked 03 May '16, 02:28
edited 03 May '16, 07:06
The intent of sending javiguembe to this site was not to ask and answer this question but to make javiguembe aware of the site so that it might be utilized to search for answers to future questions or to ask new questions. But since the question has been asked here, I'll post the relevant part of the answer I gave on the mailing list, which apparently solved the problem:
Ref: https://www.wireshark.org/docs/wsdg_html_chunked/lua_module_Proto.html#lua_class_ProtoField, specifically section 126.96.36.199.
answered 03 May '16, 07:12