ListBox become inactive.

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ASP.NET

Hi all,
I have some kind of weird problem. I am using ModalPopExtender of Ajax to popup a update panel. The same update panel is used to Drag the prop up. If I make another control to drag the pop up then it does not movable. If I take update panel as DragcontroID then popup is movable.

Now the problem is that, If I take update panel as DragContrlID then list box not allowing select any item from the same Listbox. I can do changes on the control of the popup like Textbox, RadioButton but list box is not allow.


Here is some code details.

<ajax:ModalPopupExtender ID="mdlPupExtPerioComparison" runat="server" BackgroundCssClass="modalBackground"
                       CancelControlID="btnPerioComparisonCancel" OkControlID="btnPerioComparisonOk"
                       OnCancelScript="" OnOkScript="" Drag="true"  PopupControlID="updPnlComparison"
                       PopupDragHandleControlID="rowPerioComparisionHeader" TargetControlID="btnDummyPerioComparison">
                   </ajax:ModalPopupExtender>

<asp:UpdatePanel ID="updPnlComparison" runat="server" RenderMode="Inline">
    <ContentTemplate>
        <div id="divPerioComparison" runat="server" class="HiddenControl">
            <asp:Panel ID="pnlPerioComparison" runat="server" Width="600px" Height="340px" BackColor="#EFEFEF">
                <table runat="server"   id="rowPerioComparisionHeader" class="Width100 Header" cellpadding="0" cellspacing="0">
                    <tr>
                        <td class="PaddingLeft4 Width100 Height20px">
                            <asp:Label ID="lblComparisonPopUpHeader" runat="server" Font-Bold="true"></asp:Label>
                        </td>
                        <td class="PaddingRight5">
                            <asp:Button ID="btnHeaderPopUpClose" CssClass="Button ButtonClose" runat="server"
                                OnClientClick="$find('mdlPupExtPerioComparison').hide(); return false;" />
                        </td>
                    </tr>
                </table>
</ContentTemplate>
</asp:UpdatePanel>

So I am trying to drag to popup but it is not dragging.
If I take Panel as DragControl Id then it is going to be fixed on the page at bottom and does not seems like a pop up.

Thanks
Anil