Behavior yourBehavior; // this is what you want to remove
        Group    parent;       // this is where you want to add/remove

        BranchGroup removableBehavior = new BranchGroup();
        removeableBehavior.addChild(yourBehavior);
        removeableBehavior.setCapability(BranchGroup.ALLOW_DETACH);

        parent.setCapability(Group.ALLOW_CHILDREN_READ);
        parent.setCapability(Group.ALLOW_CHILDREN_WRITE);
        parent.setCapability(Group.ALLOW_CHILDREN_EXTEND);
        parent.addChild(removeableBehavior);

With this, you can now add/remove after the scene graph is live. Call removableBehavior.detach() to remove the behavior from the scene and parent.addChild(removeableBehavior) to add it. Note: you may not need to add/remove the behavior from the graph. In many cases you can use the setEnable() method to turn the behavior on and off.

If you're seeing an error that looks something like this:

Exception occurred during event dispatching:
javax.media.j3d.CapabilityNotSetException: Locale: no capability to 
detach BranchGroup

You might have noticed that locale doesn't have setCapability method. The error is a bit misleading. The BranchGroup needs the BranchGroup.ALLOW_DETACH capability set. That should fix the problem.

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