appointment 'Write' event not firing as expected

[JohnV@nn]

I have a vsto add-in with event handlers on Close and Write. I'm not
getting the Write event when I create an appointment, press escape,
get the prompt "do you want to save changes", answer 'Yes'. I get the
Close event, but not Write. Here is the behavior I'm seeing:

Create appointment, click Save&Close: 'Write' fires, 'Close' fires
Create appointment, press escape, answer 'No': 'Close' fires
Create appointment, press escape, answer 'Yes': 'Close' fires

Note that when I close & save the appointment by pressing escape and
answering 'Yes', the appointment is properly saved in the calendar; I
just don't get the write event. Is this a known issue; can anyone
else confirm that you get the same behavior?

Thanks,
John