Is NSGradient the key? Any examples of how you hook this in with a
panel or window?
NSGradient is, as you say, the key.
Remember that drawing in Cocoa takes place in a view; from that
perspective, "Cocoa panel with a gradient background" isn't really a
well-formed concept, because it's assuming the panel draws rather than
its content view.
So just create your own custom subclass of NSView in which you
override -drawRect: to render an NSGradient, and use an instance of it
as your window/panel's content view. Or even just put it within your
window/panel's content view, covering 100% of its area, with its
springs and struts set appropriately.
-- Chris
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