[NTG-context] Color tables in MKIV

Hi! There's an example at http://wiki.contextgarden.net/Table#Background_Colors about color tables. I found that \BL and \CL works fine in MKII. Since I get black background for \BL(which is not gray) and get the following error for \CL in MKIV: ! Missing \endgroup inserted. <inserted text> \endgroup <to be read again> \endtemplate <template> \endtemplate \normalTABLEmultirule #1->& \use {#1}\normalTABLElongrule & \dodocomplexTableGL ...LEmultirule {#3}}\fi \next \doPostTableGL #2 \TABLEgrayline ->\complexTableCOLOR [2,green] \SR ... l.12 \NC \tex{AR} \NC automatic row\NC\SR Is there a easy way to achive this in MKIV? Thanks in advance.