[ODE] dGeomTransform; no collision happening

[Matthews, Steve USA]

Somebody please help....

I do the following: 
*********

dWorldID worldID = dWorldCreate(0);
dSpaceID spaceID = dHashSpaceCreate(0);

dGeomID sGeomID = dCreateSphere(0, 1.3);
dGeomSetBody(sGeomID, 0);

dGeomID tGeomID = dCreateGeomTransform(0);
dGeomTransformSetGeom(tGeomID,sGeomID);
dGeomSetBody(tGeomID, 0);

dBodyID bodyID = dBodyCreate(worldID);

dSpaceAdd(spaceID, tGeomID);
dGeomSetBody(tGeomID, bodyID);

**********

There's a lot  more in between, and the dGeomSetBody setting to a 0 body is generic in my code.  When I do the above, my sphere falls through my ground plane, but if I do the dGeomSetBody (and dSpaceAdd) on sGeomID, I have no problems.

Are there any known problems to dGeomTransform that aren't apparent from the user docs?  Can anyone see anything blatantly wrong above?

Thanks for any help, 
   Bootshine