[3DSM] Bone Help

[AndyinEngland.]

Hello. I'm having a slight problem with bones in Max 8, I'm trying to rig a character I modelled, and I'm not too sure of a way of getting past the old dependency loop problem. I have this so far:

 

 

The problem I'm having, is the control sphere I've made to control the body (The orange sphere), has no place to link to the body, therefore gets left behind when the skeleton moves. I managed to get over this problem on the arms, by linking the control spheres to the upper chest bone rather than the arms, but this isn't possible for the waist. Does anyone know how I can link the waist control sphere to the body so that it stays on the waist rather than getting left behind?

Any help is appreciated