[NTG-context] How to show footer only with chapter head

Hi, I have page numbers and chapter headings displayed in my document's header. The header is suppressed on a page with a chapter head i.e. \setuphead[chapter][header=high] therefore I want a footer on these pages to display the page number. The footer should disabled on all other pages. I've tried, \setuphead[chapter][footer=normal] but it overrides \setupfooter[state=none] everywhere, not only on chapter pages. Any ideas? TIA, Elliot