Is Apple being a liar as regards the brushed metal window contraption?

<  
http://developer.apple.com/techpubs/macosx/Carbon/ 
HumanInterfaceToolbox/WindowManager/HandlingWindowsControls/hitb- 
wind_cont_concept/chapter_2_section_6.html >

Says here that the metal brushed attribute is available to a  
MovableModal class, but it won't work (-5601 error), even if made  
Compositing attribute as it says to...what's strange is that the  
Appearance example of the document class works, without being  
compositing it would seem.

> kWindowMetalAttribute	The window has a metallic appearance (Mac OS X,  
> version 10.2 and later). Available only for document and movable modal  
> window classes. If you specify this attribute, you must also specify  
> the kWindowCompositingAttribute.



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