title: ModalPopupExtender Error
body: <p>i want to popup ModalPopupExtender in button click, but when i run my code and click on the button then ModalPopupExtender is not popup even i used all the required AjaxControlToolkit references for this</p>
  
  <h2>my code is following :</h2>
  
  <pre><code>&lt;form id="form1" runat="server"&gt;
  &lt;asp:ScriptManager ID="ScriptManager1" runat="server"&gt;
  &lt;/asp:ScriptManager&gt;
  &lt;div&gt;
      &lt;asp:Panel ID="Panel1" runat="server" BackColor="#CC3300"&gt;
      hello...
      &lt;/asp:Panel&gt;
      &lt;asp:Button ID="Button1" runat="server" Text="click here" /&gt;
  
      &lt;asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" PopupControlID="Panel1" TargetControlID="Button1"&gt;
      &lt;/asp:ModalPopupExtender&gt;
  &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>i am using the visual studio 2008 Pro., .Net Framework 3.5 and for Ajax i used AjaxControlToolkit.dll(3.5.60919.0)</p>
  
  <p>sir, plz give me solution for this..</p>