title: onserverclick wont trigger the event
body: <p>Nothing works, The button doesn't trigger the event
  code of button:</p>
  
  <p><code>&lt;input type="button" id="regBtn" runat="server" onserverclick="RegClick"/&gt;</code></p>
  
  <p>script code:</p>
  
  <pre><code>&lt;script runat="server"&gt;
  void RegClick(object sender, EventArgs e)
  {
      regBtn.Value += "a";
  }
  &lt;/script&gt;
  </code></pre>