Applying a Drop Shadow to an NSView

FROM : Tom Burns
DATE : Tue Aug 15 21:28:43 2006

I have a custom view that I would like to display with a shadow. The 
custom view is a subview of an NSBox, so it seems to me that 
subclassing NSBox would be the proper course of action. 
unfortunately, I was unable to find any example code for applying 
shadows to views themselves, as opposed to their contents. Does 
anyone have any advice for approaching this problem?

--Tom