[NTG-context] Two frames side by side?

I want two frames side by side: the left frame comprising just text (and some displayed formulas), and the right hand side frame some high level computer algebra code. The right hand side will have a gray background, and will consist mainly of typeset equations separated by horizontal lines. I can get the two frames looking just right, but no matter how thin I make them, they display one under the other, not side by side. Any ideas? Thanks, Alasdair