I get an error on drawTriangles: How to unbind a vertex buffer?

I have two models, one has a vertex buffer with position and UV coords, the other has more infos, like normals and so on.
If I render just one of them, ther work fine, but when I try to have both I get this error:
Error #3607: Stream 2 is set but not used by the current vertex program.
Now, I'm not new in 3D programming, I know both DirectX and OpenGL, and I know that OpenGL needs an "unbind" API call to clear the vertex streams, I cannot find anything similar in Molehill.
So how to unset a vertex buffer and set another one?
My code at the moment works only if my models uses the same number of vertex streams

Are you running through the Pixel Bender classes to do the drawing or going directly to the Molehill APIs?
If you're using the Pixel Bender classes could you post some source code and I'll take a look at it. If you're going directly to Molehill you might want to post your question in the incubator forum here:
http://forums.adobe.com/community/labs/flashplatformruntimes/incubator/
where it will be read by more people with Molehill experience.
Bob

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