title: htmleditorextender does not display toolbar
body: <p>I'm working on Asp.Net 4.5 on visual studio2012. I had an ajaxcontrolkit htmleditorextender which has targetId bind on asp, textbox. However i did everything in the asp.net tutorial but i could not succeed on displaying the toolbar. </p>
  
  <p>I have checked page register, toolkitscriptmanager. Still it's the same. Any ideas?
  And here is my code:</p>
  
  <pre><code>     &lt;%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit"%&gt;
  </code></pre>
  
  <p>
    </p>
  
  <pre><code>    &lt;asp:TextBox
      ID="txtComments"
      TextMode="MultiLine"
      Columns="60"
      Rows="8"
      runat="server" /&gt;
  
      &lt;asp:HtmlEditorExtender
      TargetControlID="txtComments"
      runat="server" /&gt;
  </code></pre>
  
  <p></p>