How to add a SaveOrUpdateCopy event listener in NHibernate

Question

How can I add a event listener for SaveOrUpdateCopy in NHibernate ? I see that the ListenerType enumeration does not have a 'SaveOrUpdateCopy' type. I tried using the 'Merge' type, but that adds it to the MergeEventListeners collection. The SaveOrUpdateCopy invokes the events from the SaveOrUpdateCopyEventListeners collection.

How can I add my event class to the SaveOrUpdateCopyEventListeners collection in NHibernate?

Any help is appreciated.