[Usability] HIG Clarification for "Close Without Saving" button

[Steven Garrity <stevelist silverorange com>]

I'm working on evaluating (and hopefully improving) the consistency of 
save confirmation dialogs in Gnome [1] and there's a bug in the HIG that 
is holding me up. [2]

As the comments on the bug explain, the problem is that the "Close" and 
"Close without Saving" buttons both have "C" as their shortcut key. This 
should be relatively simple to resolve.

A smaller issue (also mentioned in the bug comments): I'm not sure if 
the "w" in "Close without Saving" should be capitalized or not.

The HIG says [3] that "Command button labels" should use "header" 
capitalization and that means all initial-caps, except for "Prepositions 
of three or fewer letters: at, for, by, in, to". So I think "without" 
should have an upper-case W. Can anyone confirm/deny this?

Any help in getting this resolved would be appreciated as I'm hoping to 
help several applications improve HIG compliance in their save 
confirmation dialogs but can't until this is resolved.

Thanks,
Steven Garrity

[1] http://actsofvolition.com/include/savealerts/
[2] http://bugzilla.gnome.org/show_bug.cgi?id=162947
[3] 
http://developer.gnome.org/projects/gup/hig/2.0/design-text-labels.html#layout-capitalization