All controls have those events, because the base class has them. It is, however, possible that the inherited controls already have behaviour for those events and aren't calling them at all. In which case, they can't get rid of the events themselves (inheritance doesn't let you do that) but they can hide the events from the property browser using attributes.
Bottom line - if the event doesn't show in the property browser, it's probably for a good reason. But it's still there, and you can always wire it up with code on the off-chance that it still works.
DiverDan: Yes I did write them, thanks for the praise :) Look out for a designable Outlook Bar there in the next day or two.