ModalpopupExtender disappears while filtering data in gridview.

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.NET

.NET4

I am a newbie so please bear with me. I am using a modal popup extender to display products in a gridview. The panel that i've used for modal popup has a gridview in it and I am using a textbox to filter the gridview but whenever I enter the product code in the textbox and hit 'enter' modal popup disappears and it shows filtered data when I open it again.


Here is the code:

<asp:Button ID="btnadditem" runat="server" Text="Add Items" />
                                 <cc1:ModalPopupExtender ID="btnadditem_ModalPopupExtender" runat="server"
                                     CancelControlID="btnCancel" DynamicServicePath="" Enabled="True"
                                     OkControlID="btnSave" PopupControlID="Panel2" TargetControlID="btnadditem"
                                     PopupDragHandleControlID="popupdrag" Drag="True">
                                 </cc1:ModalPopupExtender>

<asp:Panel ID="Panel2" runat="server" Height="291px" Width="516px"
        BorderColor="Black" BorderWidth="2px" BackColor="#EEEEEE">


       <div id="popupdrag" style="width: 100%; background-color: #1B548D; height: 31px;"><div align="left" style="float:left;">
           <asp:Button ID="btnCancel" runat="server" Text="Cancel" /></div>
           <div align="center" style="float:left; width:400px; height: 31px; line-height:30px; color:#fff"><strong>Add Products</strong></div><div align="right" style="float:right;">
               <asp:Button ID="btnSave" runat="server" Text="Save" /></div></div>
               <div style="width: 100%; line-height:30px; height: 259px;";"><div style="width:50%; float:left;">
                   &nbsp;</div>
                   <div style="width:15%; float:left;">
                       <strong>Product Code</strong></div><div style="width:35%; float:left;">
                       <asp:TextBox ID="txtprodcode" runat="server" Width="90%" AutoPostBack="True"></asp:TextBox></div>
                   <asp:GridView ID="GridView1" runat="server" Width="100%" AllowPaging="True"
                       AllowSorting="True" AutoGenerateColumns="False" BackColor="White"
                       BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="3"
                       DataSourceID="SqlDataSource1" PageSize="5">
                       <RowStyle HorizontalAlign="center" />
                       <Columns>
                           <asp:BoundField DataField="prodname" HeaderText="Product Name"
                               SortExpression="prodname"/>
                           <asp:BoundField DataField="prodcode" HeaderText="Product Code"
                               SortExpression="prodcode" />
                           <asp:BoundField DataField="rate" HeaderText="Rate" SortExpression="rate" />
                           <asp:BoundField DataField="description" HeaderText="Description"
                               SortExpression="description" />
                       </Columns>
                       <FooterStyle BackColor="White" ForeColor="#000066" />
                       <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                       <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="center" />
                       <RowStyle ForeColor="#000066" />
                       <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                       <SortedAscendingCellStyle BackColor="#F1F1F1" />
                       <SortedAscendingHeaderStyle BackColor="#007DBB" />
                       <SortedDescendingCellStyle BackColor="#CAC9C9" />
                       <SortedDescendingHeaderStyle BackColor="#00547E" />
                   </asp:GridView>
                   <asp:SqlDataSource ID="SqlDataSource1" runat="server"
                       ConnectionString="<%$ ConnectionStrings:ABC %>"
                       SelectCommand="SELECT [prodname], [prodcode], [rate], [description] FROM [products] ORDER BY [prodname]"
                       FilterExpression="prodcode LIKE '%{0}%'">
                       <FilterParameters>
                       <asp:ControlParameter
                       controlid="txtprodcode" ConvertEmptyStringToNull="False" />
                       </FilterParameters>
                   </asp:SqlDataSource>
        </div>


    </asp:Panel

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