title: UIView not autoreleased. Where is my issue?
body: <p>I create <code>UIViews</code> based on xib files programmaticaly and add them to a <code>scrollView</code>. This works so far. If the amount changes I recreate the grid of <code>UIViews</code> (in my case so called theme thumbs). I remove the old ones before I recreate the new ones. The problem is the memory is never released and for every new creation memory usage piles up. Even if I remove one single thumb the memory isn´t released. </p>
  
  <p>Instruments doesn´t show leaks. <code>Dealloc</code> in my <code>ViewController</code> is never called.</p>
  
  <p>I use <code>ARC</code> and I know that I have to avoid retained references. But clearly I have used them and don´t understand where. It would be great if someone could give me a hint where I did it as I have read a lot of posts here but still don´t understand it. <code>NSZombiesEnabled</code> is off. </p>
  
  <p>My code:</p>
  
  <pre><code>-(void)createGrid
  {
      for (UIView *subview in self.scrollView.subviews) {
          if ([subview tag] &lt; 10000 &amp;&amp; ![subview isKindOfClass:[UIImageView class]]) {
              [subview removeFromSuperview];
          }
      }
      int col = 0;
      int row = 0;
      [self setupFetchedResultsController];
      for (int i = 0; i&lt;[[self.fetchedResultsController fetchedObjects] count]; i++)
      {
          col = i % THEME_COLUMNS;
          row = i / THEME_COLUMNS;
          ThemeThumbVC *themeThumb = [[ThemeThumbVC alloc] init];
          [self.scrollView addSubview:themeThumb.view];
  
          // configurate thumb
          themeThumb.managedObjectContext = self.managedObjectContext;
          themeThumb.fetchedResultsController = self.fetchedResultsController;
          themeThumb.theme = [[self.fetchedResultsController fetchedObjects] objectAtIndex:i];
          [themeThumb.themeThumbImage setImage:[UIImage imageWithContentsOfFile:[[[self.fetchedResultsController fetchedObjects] objectAtIndex:i] iconImageURL]]];
          [themeThumb setTag:i];
          [themeThumb.view setTag:i];
          [themeThumb.view setFrame:CGRectMake(col*kThemeGritXOffset+(col*1), row*kThemeGritYOffset, kThemeGritXOffset+1, kThemeGritYOffset)];
          [self addChildViewController:(UIViewController*) themeThumb];
      }
      [self.scrollView setContentSize:CGSizeMake(320, row*kThemeGritYOffset+kThemeGritYOffset)];
  }
  </code></pre>