I have activated numbering sections by \setuphead[section][number=yes], and now the numbers are in the toc, too, as they should. How to show the numbers in the header, too?

The header is: \setupheadertexts [][{\grau{\tfx\getmarking[section]}}][{\definedfont[name:myriadprosemibold at 10pt]\grau\getmarking[chapter]}][]

But the numbers of the sections are not shown in the header, only the titles.