suppressing header and keeping footer

[Bill McClain <wmcclain@salamander.com>]

I have a document with page numbers in the footer and other text in the
header. On the first page of a chapter I would like to suppress the
header but keep the page number. \setuphead[chapter][header=none] (or
header=empty) doesn't do what I would expect. The header is displayed on
the chapter page as well as the others. Am I using the wrong feature?

Here is a sample doc:

* * *
\setuppagenumbering
	[alternative=doublesided, 
	location={footer, marginedge}]

\setuphead[chapter] 
	[number=no, 
	page=right,
	header=none]

\setupheadertexts
	[]
	[{\em{\getmarking[chapter]}}]
	[{\sc How I Did It}]
	[]

\starttext 
\chapter{Introduction}
First page of chapter. Should have footer but no header.
\page
Second page of chapter. Should have header and footer.
\stoptext
* * *

-Bill