How to solve Unity3d 4.2 problem with material(if you call it at script ...)

Hi i Update my unity3d to 4.2 and i see a unusaly problem if you call or use Renderer.material at your script your Object material change to Instance of orginal material;

i want when i change option of my material (like older version)it work on Whole material (every material with name of body)

see my Photo :D i take screen shot before play after play my code >

 using UnityEngine;
 using System.Collections;
 
 public class body_alpha : MonoBehaviour {
 Public Material mymat;
 
 void Update()
 {
    mymat = renderer.material;
 }
 }