AMS font problem

[Tarik Kara]

Hans thanks for the solution you gave for my environment problem. Now I
have a new problem. I would like to use the Black board bold symbols of
AMS. I used

\setupbodyfont[ams]

in my environment file and typed

{\Bbb R}

in my document but rather then getting Bbb R a got a different symbol 
(\gtreqless of AMS). I am using ConTeXt  ver: 2001.7.2 under MikTeX.
What am I doing wrong?

Tar{\i}k