Did you call SetAddinInfoEx? The API takes in a resource module filename and image IDs for your buttons. The image is a glyph, which is a single bitmap that contains one image for each button (I use the tiling UI in the visual studio resource editor).
Take a look at the VC addin sample in the sdk (sdk\samples\addins\vc).
Posted by: R.D. Holland Post date: 9/18/2012 3:35:53 PM