title: tintColor of UIButton's ImageView is not changing
body: <p>How to change <code>tintColor</code> of <code>button.imageView</code>. If I use the same image in <code>UIImageView</code> with the same rendering mode as below the <code>tintColor</code> will change but the same is not happening for button's image view. Is it because of buttonType ?</p>
  
  <pre><code>    UIButton *frontButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
      [frontButton setImage:[[UIImage imageNamed:FRONT_IMAGE] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
      [frontButton.imageView setTintColor:[UIColor redColor]];
      [self addSubview:frontButton];
  </code></pre>