[NTG-context] How to get bolder and larger item symbol?

I'd like to have the number (and dot) in an "itemize" in boldface and larger (say, \bf\tfa). What do I do? \startitemize[n][symstyle=bold] didn't work. Why? TIA -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Adam Mickiewicz University