Is there a Source List control in Cocoa

FROM : Markus Spoettl
DATE : Wed Apr 02 02:45:50 2008

Hello,

  I'm new to all things Cocoa so please forgive me if this sounds 
stupid:

I'm looking for a way to implement a Source List / Sidebar (like in 
Mail or iTunes)? Is there something that comes with Xcode 3 (on 
Leopard) or does one have to do this by hand?

Any pointers much appreciated!

Thanks
Markus
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Markus Spoettl