Picking a leaf node

Hi,
I have a BranchGroup (under several other BranchGroups and TransformGroups) which contains a number of Leaves (Spheres). I want to be able to use picking to find out which Sphere the user clicks on - do I have to add a behaviour to the tree to achieve this, and if so, where should I add it? I am not sure of this, but it seems that the Java 3D tutorial says that only BranchGroups can be picked, can this really be?
Cheers!
/David

only BranchGroups can be picked, can this really be?No. See
com.sun.j3d.utils.picking.behaviors.PickRotateBehavior
regards

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