What's the appointment ribbon called?

[sgrosch1]

I've created an Outlook 2010 add-in that includes an Outlook For
Region. I only want my region usable if the BusyStatus is set to Out o
Office, so my thought was to get a pointer to the ribbon and then ad
some type of OnChange to the "Show As" drop-down that enabled/disable
my form.

I see the Globals.Ribbons element, but can't figure out how to get a
the AppointmentItem's ribbon from inside of the FormRegionShowing(
event

 

[Ken Slovak - [MVP - Outlook]]

Normally what you'd do is to call Ribbon.InvalidateControl(controlID) to
force specific callbacks for various types of controls, or
Ribbon.Invalidate() to force that for all your user created ribbon controls.