How to leave a group

"Antonio Augusto (Mancha)" <[email protected]>
Newsgroups gmane.comp.java.jxta.user
Message-ID <[email protected]> 
Hello there,

I've a doubt on how i do to leave a group after joining it.
I've been using the resign function of the MembershipService, but
apparently it don't quite work (i still get messages from that group).
Do i need to do something else besides the resign?

Thanks
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