Fixed the style names used in the mail sample to match the new style names used on child elements of certain widgets including DecoratedStackPanel and DialogBox.

Patch by: jlabanca
Review by: knorton (desk review)
Issue: 2203



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2850 8db76d5a-ed1c-0410-87a9-c151d255dfc7