[NTG-context] I Lose frame lines in Table

All, Still haven't got an answer for this one: \setupTABLE[background=screen,screen=0.8,color=darkred,frame=off] \setupTABLE[column][first][rightframe=on] \setupTABLE[row][first][bottomframe=on] \placetable[none]{}{% \bTABLE[align={middle,lohi},width=3em] \bTR \bTD $x$ \eTD \bTD $y$ \eTD \eTR \bTR \bTD $x_1$ \eTD \bTD $y_1$ \eTD \eTR \bTR \bTD $x_2$ \eTD \bTD $y_2$ \eTD \eTR \bTR \bTD $\vdots$ \eTD \bTD $\vdots$ \eTD \eTR \bTR \bTD $x_n$ \eTD \bTD $y_n$ \eTD \eTR \eTABLE} Why do my frame lines (rightframe=-n, bottomframe=on) disappear?