We have a ribbon with multiple tabs.  The first tab is the standard tab for all our forms, and just has a couple buttons for opening, saving, closing, etc.  So we use large buttons there.

I'm adding a specialized tab for a form that will have numerous buttons.  So we're using small images there to fit them all in.  They're using the existing space and stacking themselves within the groups.  Is there a way I can have the small buttons on this special tab display horizontally, with image on top, text on bottom like the large buttons?