FVWM: icons

[Ingo Wardinski]

Dear all,
perhaps, this is a problem with a very simple solution.
I try to force applicitions to iconify without icons. So I set
Style "Thunderbird" NoIcon,!IconTitle
and
Style * NoIcon

this is working for xterm, but not for thunderbird, firefox emacs and 
some others. Certainly, I'm overlooking something simple here any help 
would be very much appreciated

greets
ingo