[NTG-context] Table of contents

Hi! I have two question about table of contents. 1) is it possible to have the toc at the end of the document. I tried to place \placecontent or \completecontent at the end and it didn't work; I only managed to have the toc at the beginning of the document. 2) If I define my own header (like in ConTeXt an excursion: 5. Headers) and so, for example, replacing \section by \myheader, which has a section level, the table of content is empty! If the information is in another document, please give me a pointer, thanks! Alain