Mask is supported for Outlook 2002 and later. It's only for Outlook 2000
that you need to use a workaround. Are you needing to support Outlook 2000?

The trick with Outlook 2000 is to use one color as a mask color, say
magenta. That color can only be used where you want masking. Then you do
some fancy stuff with the Win32 API and separate the mask and image and pop
them onto the clipboard and use PasteFace to add the button image.

See http://www.daveswebsite.com/articles.../default.shtml for a C++
example and KB288771 for a VB example. Offhand I'm not familiar with any C#
examples but there may be some out there if you Google for "PasteFace".

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Rog" wrote in message
...
I am trying to add transparent images to CommandBarButtons in an Inspector
which of course doesn't use the mask property. I am using C#.
Does anyone have any suggestions?
Thanks