[NTG-context] No page break between chapter-title and section-title in TOC

Hi there, one simple question again: I have \chapter{Blub}... \section{Blub} \section{...} \section{....} and so the chapter title is in the table of content (TOC) above the next section-titles. I want to prevent a page-break in the TOC between the chapter-title and the next section-titles, how to do that? Thanks Huseyin