Image Button Click event not fired in PopupControlExtender

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C#

ASP.NET

C#4.0

Hi,

I have popupextender.When i clicked on button present in popupextender not fires for the first time.please help me.. urgent..

Thanks..

example:

<asp:Image ID="imgDown" ImageUrl="../Images/arrow_down1.gif" runat="server" />

                                                                                                                <asp:Panel ID="pnlInboxResumes" runat="server" Width="35px" BorderColor="#99CCFF"
                                                                                                                    BorderStyle="Solid" BorderWidth="1" BackColor="White" Style="display: none;">
                                                                                                                    <table border="0" align="left" cellpadding="3" cellspacing="0">
                                                                                                                    <tr>
                                                                                                                        <td>
                                                                                                                            <asp:DataList ID="dlInboxResumes" runat="server" OnItemCommand="dlInboxResumes_ItemCommand"
                                                                                                                                OnItemDataBound="dlInboxResumes_ItemDataBound" on RepeatDirection="Vertical" DataKeyField="Path">
                                                                                                                                <ItemTemplate>
                                                                                                                                    <asp:ImageButton ID="imgbtnResume" runat="server" ImageUrl="~/Images/ParseResume_3.png"
                                                                                                                                        CausesValidation="false" CommandName="select" EnableViewState="true"/>
                                                                                                                                </ItemTemplate>
                                                                                                                            </asp:DataList>
                                                                                                                        </td>
                                                                                                                    </tr>
                                                                                                                    </table>
                                                                                                                </asp:Panel>
                                                                                                                <asp:PopupControlExtender ID="InboxParseResumes" runat="server" TargetControlID="imgDown"
                                                                                                                    PopupControlID="pnlInboxResumes" Position="Bottom" CommitProperty="ImageUrl">
                                                                                                                </asp:PopupControlExtender>