CTRL+ALT+SHIFT+C Is not working for me I have a model I need to rotate around the center. I have put the 3D cursor in the center of the grid. I've hit the hot keys and selected "Origin to 3D cursor" but it does not move. At least not while my current object is selected. 

If I unselect the current object it does it, but when I select the object again, it goes way back up into space again.
you dont have to change the origin point to rotate around the 3D cursor,
just change the pivot point in the 3D view header to "3D Cursor"

The Blender Reference Manual covers this here:

https://www.blender.org/manual/de/editors/3dview/transform/transform_control/pivot_point/index.html