Is there a way to create events in collection editor and have the
propertygrid registered for that event?  For example, CollectionEditor could
have an OnRemove event that fires when a user click on the Remove button.  
I'd like to know when this happens (per item based) so I could have the main
application do something (e.g. update the database).  

In another word, what is the best way to synch collection type data with the
database when the collection property is exposed via the propertygrid?

Any ideas is appreciated.