Loading DetailView in ModalPopup

Hi.  I am trying to have a GridView that when the Edit LinkButton is clicked will load a DetailsView in a ModalPopup.  The selected GridView row should then be able to be edited and saved in the popup.  I've seen many articles on how to do this, but I just can't seem to get it to work.  My code is below if anyone can tell me what I'm doing wrong?

This is my source:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"><ContentTemplate><asp:GridView ID="gdvMembers" runat="server" AutoGenerateColumns="False"
        DataKeyNames="intMemberID" DataSourceID="EntityDataSource1" OnSelectedIndexChanged="gvMembers_SelectedIndexChanged"><Columns><asp:CommandField ShowDeleteButton="True" /><asp:TemplateField><ItemTemplate><asp:LinkButton ID="btnViewDetails" runat="server" Text="Edit" CommandName="Select"></asp:LinkButton></ItemTemplate></asp:TemplateField><asp:BoundField DataField="intMemberID" HeaderText="intMemberID"
                ReadOnly="True" SortExpression="intMemberID" /><asp:BoundField DataField="vcharTitle" HeaderText="Title"
                SortExpression="vcharTitle" /><asp:BoundField DataField="vcharFirstName" HeaderText="First Name"
                SortExpression="vcharFirstName" /><asp:BoundField DataField="vcharLastName" HeaderText="Last Name"
                SortExpression="vcharLastName" /><asp:BoundField DataField="vcharSuffix" HeaderText="Suffix"
                SortExpression="vcharSuffix" /><asp:BoundField DataField="vcharJobTitle" HeaderText="Job Title"
                SortExpression="vcharJobTitle" /><asp:BoundField DataField="vcharAddress1" HeaderText="Address1"
                SortExpression="vcharAddress1" /><asp:BoundField DataField="vcharAddress2" HeaderText="Address2"
                SortExpression="vcharAddress2" /><asp:BoundField DataField="vcharCity" HeaderText="City"
                SortExpression="vcharCity" /><asp:BoundField DataField="vcharState" HeaderText="State"
                SortExpression="vcharState" /><asp:BoundField DataField="vcharZipCode" HeaderText="Zip Code"
                SortExpression="vcharZipCode" /><asp:BoundField DataField="vcharPhone" HeaderText="Phone"
                SortExpression="vcharPhone" /><asp:BoundField DataField="vcharFax" HeaderText="Fax"
                SortExpression="vcharFax" /><asp:CheckBoxField DataField="bitActive" HeaderText="Active"
                SortExpression="bitActive" /></Columns></asp:GridView></ContentTemplate></asp:UpdatePanel></p><p><asp:EntityDataSource ID="EntityDataSource1" runat="server"
            ConnectionString="name=DoseRec_ABTEntities"
            DefaultContainerName="DoseRec_ABTEntities" EnableFlattening="False"
            EntitySetName="tbl_Members" EnableDelete="True" EnableUpdate="True"></asp:EntityDataSource></p><p>&nbsp;<asp:Panel ID="pnlPopup" runat="server" style="display:none"><asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional"><ContentTemplate><ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
        TargetControlID="btnShowPopup" CancelControlID="btnClose" PopupControlID="pnlPopup" OkControlID="btnSave" X="20" Y="100"></ajaxToolkit:ModalPopupExtender><asp:Button ID="btnShowPopup" runat="server" Text="Button" Visible="false" /><asp:DetailsView ID="dvMembers" runat="server" AutoGenerateRows="False"
                 DataSourceID="EntityDataSource2"><Fields><asp:BoundField DataField="intMemberID" HeaderText="intMemberID"
                        ReadOnly="True" SortExpression="intMemberID" /><asp:BoundField DataField="vcharTitle" HeaderText="vcharTitle" ReadOnly="True"
                        SortExpression="vcharTitle" /><asp:BoundField DataField="vcharFirstName" HeaderText="vcharFirstName"
                        ReadOnly="True" SortExpression="vcharFirstName" /><asp:BoundField DataField="vcharLastName" HeaderText="vcharLastName"
                        ReadOnly="True" SortExpression="vcharLastName" /><asp:BoundField DataField="vcharSuffix" HeaderText="vcharSuffix"
                        ReadOnly="True" SortExpression="vcharSuffix" /><asp:BoundField DataField="vcharJobTitle" HeaderText="vcharJobTitle"
                        ReadOnly="True" SortExpression="vcharJobTitle" /><asp:BoundField DataField="vcharAddress1" HeaderText="vcharAddress1"
                        ReadOnly="True" SortExpression="vcharAddress1" /><asp:BoundField DataField="vcharAddress2" HeaderText="vcharAddress2"
                        ReadOnly="True" SortExpression="vcharAddress2" /><asp:BoundField DataField="vcharCity" HeaderText="vcharCity" ReadOnly="True"
                        SortExpression="vcharCity" /><asp:BoundField DataField="vcharState" HeaderText="vcharState" ReadOnly="True"
                        SortExpression="vcharState" /><asp:BoundField DataField="vcharZipCode" HeaderText="vcharZipCode"
                        ReadOnly="True" SortExpression="vcharZipCode" /><asp:BoundField DataField="vcharPhone" HeaderText="vcharPhone" ReadOnly="True"
                        SortExpression="vcharPhone" /><asp:BoundField DataField="vcharFax" HeaderText="vcharFax" ReadOnly="True"
                        SortExpression="vcharFax" /><asp:CheckBoxField DataField="bitActive" HeaderText="bitActive" ReadOnly="True"
                        SortExpression="bitActive" /></Fields></asp:DetailsView><asp:EntityDataSource ID="EntityDataSource2" runat="server"
                 ConnectionString="name=DoseRec_ABTEntities"
                 DefaultContainerName="DoseRec_ABTEntities" EnableFlattening="False"
                 EntitySetName="tbl_Members"
                 Select="it.[intMemberID], it.[vcharTitle], it.[vcharFirstName], it.[vcharLastName], it.[vcharSuffix], it.[vcharJobTitle], it.[vcharAddress1], it.[vcharAddress2], it.[vcharCity], it.[vcharState], it.[vcharZipCode], it.[vcharPhone], it.[vcharFax], it.[bitActive]"></asp:EntityDataSource><asp:Button ID="btnSaVe" runat="server" Text="Save" onmouseover="MouseHover();"/><asp:LinkButton ID="btnClose" runat="server"
                    CssClass="close"/></ContentTemplate></asp:UpdatePanel></asp:Panel></p>

This is my code behind:

protected void gvMembers_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.dvMembers.Visible = true;
            this.dvMembers.DataBind();
            this.UpdatePanel2.Update();
            this.ModalPopupExtender1.Show();           
        }

        protected void btnViewDetails_Click(object sender, EventArgs e)
        {
            LinkButton btnMember = sender as LinkButton;
            GridViewRow row = (GridViewRow)btnMember.NamingContainer;
            this.EntityDataSource2.SelectParameters.Clear();
            this.dvMembers.DataBind();
            this.UpdatePanel2.Update();
            this.ModalPopupExtender1.Show();
        }