[NTG-context] \definedescription question

Hi all, I'm trying to define a description: \definedescription [Desc] [location=top,hang=3,headcolor=red] But my PDF has not color for description header (I have already \setupcolors[state=start]). Another test: \definedescription [Desc] [location=top,hang=3,headstyle={\switchtobodyfont[16pt]\red\bf}] Does not work :( Question: How to define color & font size for description header ? The document of description is not complet. Search on Wiki & Mailing list can not help me. Thank you in advance, -- http://vnoss.org Vietnamese Open Source Software Community