Making Rev apps hidden in Panther

[RGould8 at aol.com]

I've tried the below instructions for making a Mac app invisible.  For  me, 
unfortunately, it's not working.  Could it be due to Panther?

_http://www.sonsothunder.com/devres/revolution/revolution.htm?_proc003_ 
(http://www.sonsothunder.com/devres/revolution/revolution.htm?_proc003) 
which states:
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To  hide an application process in OS X, open the Info.plist file in the 
Contents  folder of the application package. Add this to the <dict>  section (it 
doesn't seem to matter where):

<key>NSBGOnly</key>

<string>1</string>                                                              
                        


Doing this will remove the process from the Dock, and from any menus that  
list active (visible) processes. To show it again, you can either put in a 0  
instead of a 1 for the <key>, or you can remove the whole  thing. 
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I'm on OS 10.3.3, using Rev 2.2, and implementing this change to the  
Info.plist file in the Contens folder of my Rev app has no effect.  My app  still 
shows up in the Dock.  Does it work for anyone  else?