how to create a black rounded-corners window in cocoa

How to create a round开发者_高级运维ed corners black window in cocoa? Is it standard and can be created by IB? Can somebody provide an example?

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You can create an NSPanel from the standard IB library. It is dark gray and translucent (not black though), and has rounded corners.

Here is a screenshot: http://grab.by/45kJ

In the library it is referred to as a HUD Window.