title: UIImageView doesn't show up in UIScrollView
body: <p>Hello I can't figure out why UIImageView doesn't want to show up in UIScrollView. 
  Now here is a little catch, I am grabbing picture from library and adding it to the UIScrollView - that doesn't seem to work.</p>
  
  <p>However if I just add picture right at "did load" method then it works just fine:
  [code]</p>
  
  <pre><code>UIImageView *tmp = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"P3130016.JPG"]];
  
  [scrollView setScrollEnabled:YES];
  [scrollView setContentSize:CGSizeMake(800, 800)];
  [scrollView addSubview:imageView];
  </code></pre>
  
  <p>I don't know why or where is the issue, please advise!</p>