[NTG-context] typesetting proofs

Dear ConTeXt users, i am trying to typeset correctly proofs in a document. I tried to use the following definition : \defineenumeration[preuve] [location=serried, headstyle=slanted, text=Preuve, number=no, after={\hfil\QED}] It's almost what i want, but there's a slight problem. The command after executes itself after a newline, so, the QED symbol is typeset at the line after the end of the proof. What i'd like to have is the qed symbol at the end of the last line of the proof. Any insight on how i can do that? Thanks