How can ZDK trial sample model move?

Hi guys. I'm new to kinect and have some problem about kinect ZDK trial model.

I downloaded kinect ZDK trial and the sample 3d model worked well with kinect. However when I copy&paste the model, hide the original one and play, it doesn't work. In other word the original one move and the copied one doesn't move. I don't know why. What's difference between them?

(My goal is to move my own 3d model by applying zig skeleton script or etc. But for this, I must know HOW the sample model works. Plz help me lol)