Problem bounding sphere collision.

I use bounding sphere algorithm for collision detection in my engine. I created an algoritm for calculate sphere''s center and radius. It is calculate correctly radius and center of my object. My question is When my object is moving, how can I move the Center of my object, excatly? (I know the radius should not be changed, because sphere is simetrical.) D3DXVECTOR CenterPlane; //Center of Plane object. D3DXMATRIX mat_PlaneMatrix; // Moving matrix of my plane. Show me the way. Thanks.