[NTG-context] bibtex: crossref / van

Dear friends, I noticed that the crossref instruction in my bib file does not work. In the documentation are no clear clues. I changed InCollection --> InBook and vice versa. I tried putting the referenced book before and after the referencing item in the bib file. In fact, a reference does appear (between brackets), but the title referenced to is not printed. I read in the archive Taco's advice of putting \setbox\scratchbox={\hbox{\placepublications}} before \completepublications, but Context stumbles at the setbox command. 2. I also have problems with sorting author names like Van den Heuvel. Under Latex I used \noopsort, but this does not seem to work under Context Does anyone have a clue? Kind regards, Robert