How to delete cell styles?

If I copy a sheet into a workbook that has a different "Normal" cell style, I get a new cell style "Normal 2". In Excel 2003, I could bring up the style dialog box and delete the extra style. I can't seem to get to that dialog box under Excel 2010 (oh, how I hate the ribbon.)

Appreciate any assistance on how I can delete cell styles!

Cheers,
Michael E.
Washington, D.C.