I am trying to define my own images for a custom ribbon in 2010. Doing this for buttons is easy but I have hit a problem when the size of the Word window is reduced. If each Group is set to autoscale then as the window gets smaller the buttons get smaller until a default image for the Group is shown (and ultimately the entire ribbon is hidden). The default image for a Group is plain with a circle in the middle. How do I use my own images for each custom Group I have?