What's missing for this to work ?

\definereference[GoToToC][\goto{ToC}[myToC]]

\def\myButtons
    {\interactionbuttons[width=1cm][
        GoToToC,CloseDocument]}

\setupinteraction[state=start]

\setupfooter[state=start]
\setupfootertexts
    [\hfill \myButtons \hfill]
%    [\hfill test \hfill]

\showframe
%\showsetups

\starttext
\reference[myToC]{}
\placecontent

\chapter{Chapter 1}
\input knuth
\stoptext

Thx,
Alan