[Solved] ASP.Net Ajax AutoComplete list appearing behind Modal popup

Hi,

I use the ModalPopupExtender with the GridView to View/Edit data row.

My code working and don't have error, but when I type the name of the country I want to search in the txCountry TextBox, in the ModalPopup, the list appears behind the ModalPopup, i.e. as if I'm searching in the GridView.

Any suggestion? My code below.

<!--Start Panel to Edit record-->
<asp:Button ID="btnShow" Visible="true" runat="server" />
<ajax:ModalPopupExtender ID="ModalPopup" runat="server"
    TargetControlID="btnShow"
    BackgroundCssClass="modalBackground"
    PopupControlID="PnlShow">
</ajax:ModalPopupExtender> 
<asp:Panel ID="PnlShow" runat="server" Style="display: none; background-color: gainsboro;"
    ForeColor="Black"
    Width="900" Height="500">
    <asp:Panel ID="panelEdit" runat="server"
        Style="cursor: move; font-family: Tahoma; padding: 2px;"
        HorizontalAlign="Center" BackColor="#cc0000"
        ForeColor="White" Height="25"> 
            <asp:AutoCompleteExtender
                ServiceMethod="GetSearchUser"
                ServicePath="Prefix.aspx"
                MinimumPrefixLength="1"
                CompletionInterval="10"
                EnableCaching="false"
                CompletionSetCount="10"
                TargetControlID="txCountry"
                ID="AutoCompleteExtender2"
                runat="server"
                FirstRowSelected="false">
            </asp:AutoCompleteExtender>
            <asp:Label ID="Label5" runat="server"
                Text="Country *" Style="font-size: 12px; font-weight: bold; color: crimson;"></asp:Label>
            <asp:TextBox ID="txCountry" runat="server"
                CssClass="pure-u-23-24"></asp:TextBox>
    </asp:Panel> 
</asp:Panel>
<!--End Panel to Edit record-->

static MySqlDataAdapter da;
static DataTable dt;
 
[ScriptMethod()]
[WebMethod]
public static List<string> GetSearchUser(string prefixText)
{
    DataTable Result = new DataTable();
 
    string str = @String.Format("SELECT Country FROM `hCountry` ");
    str += String.Format(" WHERE Country LIKE '" + prefixText + "%';");
 
    using (MySqlConnection con =
            new MySqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
    {
        da = new MySqlDataAdapter(str, con);
        dt = new DataTable();
        da.Fill(dt);
        List<string> Output = new List<string>();
        for (int i = 0; i < dt.Rows.Count; i++)
            Output.Add(dt.Rows[i][0].ToString());
        return Output;
    }
}