It's usually about claustrophobia. Tying removes his ability to escape. I agree with Boo, try tiring him out first then see how well he'll tie. He will begin to see it as a time to rest. The same advice helps if the horse wont' stand for the farrier.
My gelding has the same issue after I unsaddle him. He now ties with a rope halter and everytime he starts to paw or set back I ignore him and let him stand there longer and longer. When he stand quietly I tell him good boy and then I release him. If you let him go while he is still being fidgety you are teaching him that its a good thing. Posted via Mobile Device