Hello Danny, maybe this is interesting for you,
in a Dutch-forum it's said:
that the image suggest: the sun of Solo.
The (royal) Madurese wanted to show that their family was related to the Sunan, (See the arms of the Sunan: there are sunbeams in processed)
(hope I have translated well)
to see the original topic with picture:
http://www.dekris.nl/forum/topic.asp?TOPIC_ID=65