title: ActiveTab setting in javascript
body: <p>When i am setting the tabcontainer first tab as active tab through javascript with the following code :   </p>
  
  <pre><code>var tc = document.getElementById('&lt;%= tabContainer.ClientID %&gt;');
  tc.firstChild.lastChild.style.visibility = "hidden";
  tc.set_activeTabIndex(0);
  </code></pre>
  
  <p>i am getting the exception like:</p>
  
  <p>Propert or method not supported with this object.</p>
  
  <p>note that the second line succefully hides the second tab panel but the third line raises the excception</p>
  
  <p>Any suggestion how to set a tab active through javascript?</p>