Gridview Row Selection in ModalPopupExtender [Using VB]

Hello EE!

I need some assistance in implementing the correct script for a gridview control that is displayed using the ModalPopupExtender control. Currently I have a panel that has a gridview control (gv1) and I'm trying to "select" a row and get the datakey for that given row. I've added a RowCommand event to my code behind and using e.CommandArguement.ToString() to get my row value which does work. However, my real concern is a flicker that takes place when I select the row... how can I eliminate this? I want to keep my modal window open without a flicker.

Any guidance or suggestions will be greatly appreciated.

Protected Sub gv1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gv1.RowCommand

        If e.CommandName = "Select" Then

            ModalPopupExtender1.Show()

            Dim empID As Integer = e.CommandArgument.ToString()
            Label1.Text = empID.ToString

        End If


    End Sub


=====
.aspx
=====

        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:Panel ID="PanelOutter" runat="server" CssClass="modalBoxImg" Style="display: none;">
        <div class="modalInner">
        <div class="modalTitle">
        I am ...
        </div>
        <asp:GridView ID="gv1" runat="server" DataKeyNames="EMP_ID" OnRowCommand="gv1_RowCommand">
        <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="selectEmp" runat="server" CommandArgument='<%# Eval("EMP_ID") %>' CommandName="Select">View Details</asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
        </Columns>
        </asp:GridView>
        <asp:Button ID="Process" runat="server" Text="This is me" />
        <asp:Button ID="Cancel" runat="server" Text="Cancel" />
        <asp:Label ID="Label1" runat="server" />
        </div>
        </asp:Panel>
        <asp:Button ID="ShowBtn" runat="server" Text="Button" Style="display: none;" />
        <cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="ShowBtn" CancelControlID="Cancel" PopupControlID="PanelOutter" BackgroundCssClass="bgModal">
        </cc1:ModalPopupExtender>

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