title: PageControl backgroundColor when used in UIPageViewController
body: <p>I'm trying to implement a simple tutorial using UIPageViewController in iOS7. I implement all methods in UIPageViewControllerDataSource and it gives me a UIPageControl. Everything works except that the pageControl's background is not transparent so it blocks part of the other views behind it.</p>
  
  <p>I try to change the pageControl's appearance with the following code </p>
  
  <pre><code>pageControl.backgroundColor = [UIColor greenColor];  //works, background is green
  
  pageControl.backgroundColor = [UIColor clearColor]; //not working, background is black.
  </code></pre>
  
  <p>//updates
  It turns out that the black color is the background color of the PageControl's layer. And this Page Control layer is not on top of my own ViewControllers that I used for pages. They are in parallel.So no matter how I modify its colors, I cannot get my ViewControllers to take the full screen. </p>
  
  <p>Is there an easy way to move the PageControl on top of my ViewControllers? </p>