Am 11.06.2013 um 14:36 schrieb Jan Pohanka <xhpohanka@gmail.com>:

> 
>>> \convertnumber does not work on command parameter. What am I doing wrong? I know that I can use conversion key in setuphead, but I need slightly more complicated command.
>> 
>> Use \setuphead[section][conversion=I], you can’t use \convertnumber
>> because the first argument is the formatted (styles and colors are applied)
>> content of the section number.
>> 
>> 
> Thanks, I'm aware of this method and I mentioned it in the original question. The question is what to do if I need to use the command key to apply more complex formating using \framed etc.
> At least I need to make  \section{My section title} to print
> 
> I. Section
> My section title


You can create your own section layout.

\definesectionalternative[mysection][renderingsetup=mysection]

\startsetups[mysection]
  \vbox\bgroup
    \headsetupspacing
    \strut\headnumbercontent\par
    \begstrut\headtextcontent\endstrut
  \egroup
\stopsetups

\setuplabeltext[en][section={}{Section]

\setuphead[section][alternative=mysection]

Wolfgang