[NTG-context] Using catcode table in MkII

Hi, How do you use catcodetables in MkII. The following works fine in MkIV \unprotect \newcatcodetable\vimcatcodes \startcatcodetable \vimcatcodes \catcode`\^^I = \@@active \catcode`\^^M = \@@active \catcode`\^^L = \@@active \catcode`\ = 12 \catcode`\^^Z = \@@ignore \stopcatcodetable \protect \starttext \pushcatcodetable\vimcatcodes hello \popcatcodetable \stoptext but gives ! Missing $ inserted. <inserted text> $ <to be read again> \vimcatcodes l.14 \pushcatcodetable\vimcatcodes in MkII (both pdftex and xetex). What am I missing? Aditya