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UIButton*rightButton = [[UIButton alloc]initWithFrame:CGRectMake(0,0,30,30)];
    
    [rightButton setImage:[UIImage imageNamed:@"search.png"]forState:UIControlStateNormal];
    
    [rightButton addTarget:self.navigationController action:@selector(popViewControllerAnimated:)forControlEvents:UIControlEventTouchUpInside];
    
    UIBarButtonItem*rightItem = [[UIBarButtonItem alloc]initWithCustomView:rightButton];
    
    self.navigationController.navigationItem.rightBarButtonItem = rightItem;