I am trying to format an Excel 2007 column heading with a title and subtitle in the same cell. I use Alt+Enter to put the sub-title on its own line, and then I highlight the subtitle and make the font-size smaller. This looks fine in edit mode (F2), but when I save the change, the title and sub-title both display the original font-size. If I press F2 again, I see the changes made to the sub-title font size, but it disappears again once I save the cell.
Any help on this would be greatly appreciated.