How to set color file labels?

FROM : Piotr Adamski
DATE : Sun Mar 30 17:45:47 2008

Hi All.

Is there any way to change Finder color file label with use of Cocoa? 
I've managed to retrive it (with use of MDItemCopyAttribute) but have 
no idea how to change it. I've been googling around with no success, 
so I've decided to ask you.

Thanks.

Piotr Adamski || <email_removed>
jabber : <email_removed> || skype : piotr.adamski.