[Zope] ZCatalog result and size= problem.

hi all, I installed Zope-2.1b1 and tried ... <dtml-call "REQUEST.set('results', Notizen({'meta_type' : 'Notiz'))"> ... <dtml-in results sort=bobobase_modification_time reverse size=Number> where "results" is a Catalog result and "Number" a number. "Notizen" is the instance of a ZClass which I derived from ZCatalog. Everything works, except that I always get ALL results and not just #Number. Any idea what is wrong here? -- Tom