I have a modal within a modal and it works properly. but then i notice when the 1st modal exceed from the screen and appears a scroll for the 1st modal it works but when i open the second modal and close it, the 1st modal won't scroll.

Heres a snippet to show you.

```html
<!DOCTYPE html>
<html lang="en">
<head>
  <title></title>
  <meta charset="utf-8">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>
<body>

  <button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#test1">Open Modal 1 </button>

<div id="test1" class="modal fade" role="dialog" style="z-index: 1400;">
  <div class="modal-dialog">
    <!-- Modal content-->
    <div class="modal-content">

      <div class="modal-body">
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       <button type="button" class="btn btn-info btn-lg" data-toggle="modal"      data-target="#test2">Open Modal 2</button>

      </div>      
    </div>
  </div>
</div>

<div id="test2" class="modal fade" role="dialog" style="z-index: 1600;">
  <div class="modal-dialog">
    <!-- Modal content-->
    <div class="modal-content">

      <div class="modal-body">

        content

      </div>      
    </div>
  </div>
</div>

</body>
</html>
```

does anyone know why it fails to scroll when i open and close the 2nd modal.?
Thanks in Advance.