OL2007, VSTO C#.

I have a custom drop-down item on the read email ribbon that appears when
the user opens an email, allowing the user to select a custom "Processing
Department" tag for the email. They can choose one of 15 custom
classifications.

I also want that drop-down icon to appear when a user is previewing an email
from the main Outlook window so they can classify the email without having
to open it.

Is there any way I can embed that ribbon custom drop-down item into a form
region (which displays below the email body preview window) so I can reuse
it's functionality? (Each processing department listed in the drop down
items has a unique icon we created).