dirty flag for os x widget in window titlebar

[Meitnik at aol.com]

 I hope there is a way to set the dirty visual clue under os x for signaling 
that the doc one is editing has not been saved (and clearing it once doc is 
saved). And is there such a visual clue under xp or win2k??
Anyone have a suggestion?? Do I need to bugzilla a feature request?

Thanks, Andrew