I want to use a dedicated font size for the chapter title, so I wrote this 
piece of code:

%%%%%%%%%%%%%%%%%%
\def\mybig%
  {\dosingleempty\dosanhao}
\def\dosanhao[#1]%
  {\switchtobodyfont[24pt]}

\setuphead
   [chapter]
   [style=\mybig]
 
\starttext
\chapter{hello, world}

\stoptext
%%%%%%%%%%%%%%%%%

However, the error is:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
! Use of \dosanhao doesn't match its definition.
\doifnextcharelse ...token =#1\def \!!stringa {#2}
                                                  \def \!!stringb {#3}\futur...
\@@kochapterstyle ->\mybig 
                           \bf 
\doconvertfont #1->\edef \p!defined {#1
                                       }\ifx \p!defined \empty \else [EMAIL 
PROTECTED] \d...
\dosetfontattribute ...me [EMAIL PROTECTED] \endcsname \fi 
                                                  \empty 
\doplaceheadnumbertext ...bute {\??ko #1}\c!style 
                                                  \dosetcolorattribute {\??k...
\dodododoconstructhead ...{\finalsectionnumber }}}
                                                  \writesection {#1}{#3}{#4}...
l.11 \chapter{hello, world}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

If I replace the \mybig with \switchtobodyfont in style=xx, it works fine. 
What's the difference between  them? and why the former does not work?

-- ruini







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