[NTG-context] How not to print the chapter number

I wish to print my texte as I Foo 1 Bar one 1.1 barbar one 1.2 barbar two 2 Bar two 2.1 foofoo one 2.2 foofoo two I don't want the Roman I printed in the numbering. With contextmark II I just added \setupsection[section-3][previousnumber=no] but it doesn't seem to work in mark IV. Is there a way to do it ? -- Eric Détrez Informatique Lycée Faidherbe, Lille http://eric-detrez.fr