Hi,
You need to know the explicit monitor based on which classes is needed. The following link maybe is helpful:
http://contoso.se/blog/?p=195
BTW, this forum is for SCE related issues. For questions about System Center Operations Manager 2007, please use the Microsoft public newsgroups for SCOM which would be the most relevant newsgroup for your question.
http://technet.microsoft.com/en-us/opsmgr/bb839593.aspx
HTH.