[NTG-context] Why doesn't this margin= have an effect?

I am trying to get the itemized lists to be indented the same amount as my paragraph first lines (small). I have been trying to get this by adding margin=dimension but whatever dimension I put there, the result is the same: nothing. Example: \startitemize[n,packed,joinedup][margin=-1em] \item All X are Y; \item All Y are Z; \item Therefore, all X are Z. \stopitemize What am I doing wrong? G