transparent region for Cocoa window

FROM : c v
DATE : Sat Jan 12 18:40:17 2002

Hi, and happy new year !

  Programming with Cocoa, I would like to set the transparency  factor of
some part of the same window. The  "setAlphaValue" do this for all
pixels of the window. Is there a way to do the same with just some part
of the window ?

A function , NSDrawWindowBackground function seems (according to its
name..) to help to do that but it's not supported.


Thanks,
Charles

Charles Valat <<email_removed>>