how to snap to center of 3d object 3D Max

what snaps do I turn on so I can snap a helper to the center of an object
Answer #1
Well you could look in the manual
or have a look here:
http://www.google.co.uk/search?q=3ds+max&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&redir_esc=&ei=9W_CTO2xAYWy4AbD1tSABA