ModalPopupExtender with Async callback

///This is in the desing mode
 
//This is the check box the user will click to trigger modal popup. refer code behind
  <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="true" OnCheckedChanged="CheckBox1_CheckedChanged" />
 
 
//Everthing below is for Modal popup
<asp:Button runat="server" ID="hiddenTargetControlForModalPopup" style="display:none"/>
        <ajaxToolkit:ModalPopupExtender runat="server" ID="programmaticModalPopup"
            BehaviorID="programmaticModalPopupBehavior"
            TargetControlID="hiddenTargetControlForModalPopup"
            PopupControlID="programmaticPopup" 
            BackgroundCssClass="modalBackground"
            DropShadow="True"
            PopupDragHandleControlID="programmaticPopupDragHandle"
            RepositionMode="RepositionOnWindowScroll" >
        </ajaxToolkit:ModalPopupExtender>
        <asp:Panel runat="server" CssClass="modalPopup" ID="programmaticPopup" style="display:none;width:350px;padding:10px">
            <asp:Panel runat="Server" ID="programmaticPopupDragHandle" Style="cursor: move;background-color:#DDDDDD;border:solid 1px Gray;color:Black;text-align:center;">
                ModalPopup shown and hidden in code
            </asp:Panel>
                You can now use this sample to see how to use ModalPopup with an invisible TargetControl. The ModalPopupExtender
                this popup is attached to has a hidden target control. The popup is hidden 
                <asp:LinkButton runat="server" ID="hideModalPopupViaServer" Text="on the server side in code behind" OnClick="hideModalPopupViaServer_Click" /> and 
                <a id="hideModalPopupViaClientButton" href="#">on the client in script</a>.
           <br />
        </asp:Panel>
 
 
 
 
///And in the Code behind it is like this
 
 
 
 protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        programmaticModalPopup.Show();
        DBActivityDelegate d = new DBActivityDelegate (DBACtivityMethod);
        d.BeginInvoke(new AsyncCallback(HidModalPopup))
    }
 
 
public void HidModalPopup(IAsyncResult R )
{
        programmaticModalPopup.Hide();
}

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