office xp menu icons in c#

[Luc Benninger]

I try to write a small Office XP add-in using interop-objects in c#. To add
icons
to my new menu in the Office menu bar I should have stdole.IPictureDisp
references to the icon pictures (using the picture and mask property of the
commandbarbutton object).How can I create such a reference? If
possible I would like to cast the image property of a
System.Windows.Forms.PictureBox object.
Thanks a lot
Luc