On 2013–06–03 honyk wrote:

> How can I keep numeration and title together?

You can create a custom head alternative. The following code is
copied from the source, I only replace the \par with
\kern\headnumberdistance. Have a look at strc-ren.mkiv for other
layouts.

\setuphead
  [section]
  [alternative=middle_nolinebreak]

\defineheadalternative
  [middle_nolinebreak]
  [alternative=vertical,
   renderingsetup=headrenderings:middle_nolinebreak]

\startsetups[headrenderings:middle_nolinebreak]
  \vbox {
    \headsetupspacing
    \veryraggedcenter
    \let\\\endgraf
    \let\crlf\endgraf
    \ifconditional\headshownumber
      \strut
      \headnumbercontent
        \kern\headnumberdistance
    \fi
    \begstrut
    \headtextcontent
    \endstrut
  }
\stopsetups

\starttext
  \section{The First Section}
\stoptext

Marco