Setting control size

If I add controls (CXTPControlButton, CXTPControlEdit, etc.) to a group in a tab in my ribbon bar, I see that the width of each control depends on the control's content. For example, if I add three buttons with captions "A", "B", and "This Is A Long Caption", then the width of the group (or at least that column in the group) is determined by the third button--but the first two buttons don't stretch to fill in the space, and are left-justified within the column.

Most controls seem to exhibit the same behavior, but I see that for some reason CXTPControlEdit has a SetWidth() member. Is there any way to set the width of other controls, or to specify a minimum width for all controls in a group? Is it possible to center controls in their column of the group?

Is there any layout capability (like Qt has, if you know Trolltech's product)?

Thanks, not sure why I didn't see that earlier...