NSWindow title bar icon without representedURL

FROM : jonathan@mugginsoft.com
DATE : Thu Feb 21 13:07:05 2008

Hello All

I would like to place an icon in the window title bar without a 
corresponding representedURL.
I know what the HIG says about this but I would like to emulate 
finder's behaviour when selecting an item from its outline view sidebar.

I have a list of local and network resources and would like the 
titlebar icon to reflect the selection (local or network) as the user 
may collapse the resource browser, denying them info regarding the 
resource they are operating on.

Can I create an NSUrl proxy of some sort?

Or is just one of those "it's right in front of you, Dummy" situations.
If so, please address replies to "Dear Dummy,".

The target is Leopard.

Regards

Jonathan