How to create a new type of annotation?

Hi,

I have been trying to create a custom annotation, but couldn't get any hints. I found this is the SDK that to create a new annotation type, we should write few callbacks and specify them in AVAnnotHandler structure and register them with AVAppRegisterAnnotHandler. I didn't get any elaboration on how to create and register a new type of handler.

Please guide or provide some sample on this. I am on an urgent deadline. Quick help will be appreciated.

Thanks!