C++ How to use BlackBerrys MessageService filter API?

C++ How to use BlackBerrys MessageService filter API?

How does one use the MessageFilter API in BlackBerry 10?
I have this so far;
bb::pim::message::MessageFilter filter;
// filter.Participants.QString("XXXXX3");
filter.insert(bb::pim::message::MessageFilter::Participants, "XXXXXXX");
QList<bb::pim::message::Conversation> convos =
messageService.conversations(smsAccountId,filter);
Not sure if its right though?
Thanks