Chapter number and titles in separate lines with grid layout

[Alex Leray via ntg-context <ntg-context@ntg.nl>]

Hello again,

I'm having another issue: I'd like Chapter/Section number and titles in 
separate lines but with grid alignement. I followed that advice:

https://wiki.contextgarden.net/Titles#Chapter_number_and_titles_in_separate_lines

I'm having an issue though: I can't get rid of the space above the 
(framed) title and align the section number with the first line (it's on 
the second line)

Any idea? Many thanks.

###

\showframe
\showlayout
\showgrid

\setuplayout[
     grid=yes,
]

\define[2]\MySection{\framed[
     location=keep,
     frame=on,
     width=broad,
     % height=22pt,
     align=middle
]{{#1.\\#2}}}

\setuphead[section][
     strut=no,
     conversion=Romannumerals,
     style={\bf\WORDS},
     align=middle,
     command=\MySection,
]

\starttext
\startsection[title={First section}]
this is the text
\stopsection
\stoptext

###
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