title: UITableview freeze the app while scrolling
body: <p>hai Guys,
           in my app i am using the combination of tabbarcontroller, navigation controller and tableview controller.</p>
  
  <p>The view hierarchy of the app is</p>
  
  <pre><code>  UITabBarController
               |
               |_ UINavigationController
                      |
                      |_ UITableView
                             |
                             |_ UITableView
                                    |
                                    |_ UIViewController
  </code></pre>
  
  <p>in first tableview every thing works fine. but in second tableview when i try to scroll up/down the application just freeze. some time it get crash. when it crashes it said EXC_BAD_ACCESS. Actually i have customize the content of the cell will background image and icons the text of the label is parsed from the xml and stored in NSMutableArray the array is a property with retain. This bug really make me crazy.</p>
  
  <p>Thanks a lot for your help!!!!</p>