Retrieve related objects to ESX, DSCluster, DS. etc

Hello,

I'm looking to replicated the functionnality found in vCenter that helps find a related object.

Like now I'd like to see all the ESX Clusters linked to a Datastore Cluster. I can't seem to find a relation, and now I'm browsing through the MOB and I'm getting a headache! I can't seem to find a good pattern that would always work to retrieve that info.

Anyone else tried that before ?

Thanks!