oops, wrong forum. should go to the weld forum, sorry to bother you.
If you've already found an answer on the weld forums great. If not, this is pretty easy to do. In your action method you simply call the injected Conversation.begin() method When you want to end the conversation you call the end() method. Unless you're doing a GET JSF request you won't need the cid param, it's already in the component tree.