[NTG-context] Set background color for a single page

Sometimes, I only want a single page, say, the titlepage or page 32, with colored background rather that the whole document. Here are some codes: \starttext% titlepage (yellow) \startmakeup[standard] \midaligned{How to make document} \stopmakeup % page1 (gray) Many \CONTEXT\ users $\ldots$ \page % page2 (darkyellow) Many \TEX\ users $\ldots$ \stoptext Of course, it is awful that if I set the titlepage yellow, page1 gray and page2 darkyellow. How can I achieve this? regrads, Tim