ajax and modal popup extender

hi to all

I have a scanerio thai need to be resolved ..

I have grid and it shows certain record on searching ..and have few columsn like transactionID .Stauts etc etc ..also it have
ModalPopupExtender under the panel (asp panel )

when i click on status column ..it should show modalopopup that show two things ..ErrorCode ,,ErroDescription based in transactionID

now let me show certain code (Existing code ) ..can any one complete my code existing one or help me out to get the desired solution ...

<asp:GridView ID="GV_Main" runat="server" SkinID="GVundefinewidht" Width="100%"
            onpageindexchanging="GV_Main_PageIndexChanging"
            onrowdatabound="GV_Main_RowDataBound" onrowdeleting="GV_Main_RowDeleting"
            onrowediting="GV_Main_RowEditing" onsorting="GV_Main_Sorting"
              AllowSorting="true"    AutoGenerateColumns="False"
        ShowHeader="true" onrowcreated="GV_Main_RowCreated" ><RowStyle HorizontalAlign="center" /><Columns ><asp:TemplateField HeaderText="Status"    ShowHeader="False"><HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle"/><ItemStyle HorizontalAlign="Center" /><ItemTemplate ><asp:ImageButton ID="lbl_Status" Visible="true"   runat="server"
                                                CommandName ='<%# Eval("ACTION_NAME") %>'   OnCommand="Showstatus"
                                                CommandArgument='<%# Eval("P_TRANSACTIONID") %>'
                                                ImageUrl="~/images/status1.gif"  CausesValidation ="false" /><asp:Panel ID="pnlPerson" runat="server" Style="display: none" Width="400px" Height="200px"
                                BackColor="White" BackImageUrl="~/images/loginbox1.jpg"><div style="float: right; margin-right:10px; margin-top:7px;"><asp:LinkButton ID="lnkClose" runat="server" Font-Bold="true" ForeColor="White" Font-Size="12px">Close</asp:LinkButton></div><table width="100%"><tr><td style="height:30px; width:20px;"></td><td></td> <td></td></tr><tr> <td></td><td align="left"><asp:Label ID="lblBank" runat="server" Text="Error Code:"></asp:Label></td><td align="left"><asp:Label ID="Label1" runat="server" Text="Error Code:"></asp:Label></td></tr></table></asp:Panel><cc1:ModalPopupExtender ID="extPerson" runat="server" TargetControlID="lbl_Status"
                                PopupControlID="pnlPerson" DropShadow="true" CancelControlID="lnkClose"  /></ItemTemplate></asp:TemplateField><asp:TemplateField HeaderText="Transaction ID"
SortExpression="P_TRANSACTIONID" ShowHeader="True"><HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" /><ItemStyle HorizontalAlign="Right" /><ItemTemplate><asp:Label ID="lbl_P_TRANSACTIONID" runat="server"
Text='<%# Eval("P_TRANSACTIONID") %>' Width ="100px"
CausesValidation ="false" /></ItemTemplate></asp:TemplateField></Columns> </asp:GridView>