title: UIButton image gets pixelated when highlighted
body: <p>I have an UIButton (type:custom) in an UIView set up in the interface builder, add an image for the default state to it with retina sizes. When I try on my iPhone, I see the retina version of the image, when I highlight it by tapping it it gets pixelated while being highlighted.</p>
  
  <p>The funny part is when I change the image of the UIButton by code, there is no pixelated error.</p>
  
  <p>Does anyone know a workaround without loading all my button images by code? thnx!</p>