CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = CGRectMake(0, 0, headerView.bounds.size.width, headerView.bounds.size.height);
//gradient.frame = CGRectMake(5, 5, 310, 48);
//DLog(@"gradient frame height = %f", self.bounds.size.height);
gradient.colors = [NSArray arrayWithObjects:[UIColor lightGrayColor].CGColor, [UIColor darkGrayColor].CGColor, nil];
[headerView.layer insertSublayer:gradient atIndex:0];