transparent shadow on vray mat???

[kamima]

sorry for my awful english. Can anyone help me how to create a transparent shadow from light passes through glass object. I got the shadow but they're black (not so black, but still not true glass shadow, please understand what i mean). I use brazil and when i use Bglass i dont have problem.
I'm setting up the scene only with torus knot and plane, added with a spot light. Only different on renderer and material. The GI is turned on.
i'm a beginner in this vray thing.
Should i use vray light??
Please somebody help!!

[natty]

Hi ... you need to tick ..Affect Shadows on the material itself..

[yage]

and "transparent shadows" on the vray-shadow-parameters. (make sure you've really chosen vray-shadow)