title: UIImageView not showing the background View if the image has transparent regions
body: <p>I have a <code>UIView</code> has some labels and buttons on it. </p>
  
  <p>Next I also have a image which has a square area that is transparent, now 
  if I create a <code>UIImageView</code> and add this image which has transparent regions I am not able to see the background view (which has buttons and labels) through this transparent image.</p>
  
  <p>If I play with the alpha value that doesn't work as intended which is to see the transparent regions exactly as it would have appeared on the <code>UIView</code> which has the labels and buttons.</p>
  
  <pre><code>UIImage* image = [UIImage imageNamed:@"TI1.jpg"];
  UIImageView* imageView = [[UIImageView alloc] initWithImage:image];
  [self.view addSubview:imageView];
  </code></pre>
  
  <p>Also I would be interested to know if there is other way to achieve what I am trying to achieve. </p>
  
  <p>Basically I want to highlight a certain area of the view which has buttons/labels and make the rest of the area greyed out. My idea was to have this <code>UIImageView</code> with transparent regions in image to achieve that.</p>
  
  <p>Thanks
  Ankur</p>