ASP.NET AJAX Modal Popup Execute Server code

Here is my scenario I'm testing out the Modal Popup extender in the ASP.NET 2.0 AJAX Control Toolkit. I got the Modal Extendering working. However, I want to execute server side code once the user selects OK. I want the modal popup to disappear and execute the server side code.  Code snippet below

<asp:Panel ID="Panel1" runat="server" CssClass="modalPopup" Style="display: none" Width="233px">
   <p>Are you sure you want to Continue</p>
   <br />
   <div align="center">
      <asp:Button ID="OkButton" runat="server" Text="OK" />
      <asp:Button ID="CancelButton" runat="server" Text="Cancel" />
   </div>
   </asp:Panel>
<ajaxToolkit:ModalPopupExtender ID="popup" runat="server" 
             TargetControlID="LinkButton1"
             PopupControlID="Panel1"
             BackgroundCssClass="modalBackground"
             DropShadow="true"
             OkControlID="OkButton"
             OnOkScript="onOk()"
             CancelControlID="CancelButton" />
 
<script type="text/javascript">
    function onOk()
    {
        
    }
</script>
 
Server code to execute
protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Label1.Text = "You clicked me!";
    }

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