// bgView is an UIImageView
  UIImage *img = [bgView image];
  [img compositeToPoint:CGPointMake(0,0) operation:UICompositeSourceOver];
  struct CGRect rect = [button getRect];
  NSLog(@"point: %f, %f", rect.origin.x, rect.origin.y);

  // selected is an UIImage
  [selected compositeToPoint:rect.origin operation:UICompositeSourceOver];
  [bgView setImage:img];