title: Css style stops working on partial postback
body: <p>in a ASP.net C# application</p>
  
  <p>I have a Checkbox with a custom css.</p>
  
  <p>the Css file is:</p>
  
  <pre><code>&lt;link href="css/default.css" rel="stylesheet" type="text/css" /&gt;
  </code></pre>
  
  <p>the check box</p>
  
  <pre><code>&lt;input id="boxcheck" runat="server" type="checkbox" checked="checked" class="customCheckbox" onclick="ChangeSett();"/&gt;
  </code></pre>
  
  <p>Everything works correctly.</p>
  
  <p>But when I put it inside an update panel. The style is lost when I do a partial postback.</p>
  
  <p>Thanks for any help</p>