NLB WMI programming

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I have a C++ COM app that is trying to manage NLB using WMI.
I am using "MicrosoftNLB_" classes for this.
I could bind the NLB to NIC and also could modify the cluster setting.

Now i am trying to add/rem port rules to an NLB cluster.
None of the "MicrosoftNLB_" classes have methods to add/rem port rules.
I tried creating a new instance of "MicrosoftNLB_PortRuleEX" using "IWBemWebServices::PutInstance".

Any pointers ?

Thanks -John
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