index Gridview Attribute onclic with button hidden - indexing

Question

I need select row in gridview with a button hidden, but without postback because i need that stay on position clicked in gridview, this step i got it, but when i clicked on row capture index = 0, but when i click in button (no hidden in this time), capture correct index, how can I do this, thanks for your help or any idea.
my code is:
aspx:
<asp:UpdatePanel ID="UPGrvConfident" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="table-responsive" id="gridDentalNetworkContainer" style="overflow: auto; height: 207px; cursor: pointer; padding: 0px">
<asp:GridView ID="gridDentalNetwork" EnableViewState="true" AllowSorting="false" runat="server" GridLines="None" Width="100%"
EmptyDataText="No hay elementos a mostrar." AutoGenerateColumns="false" ClientIDMode="Static"
DataKeyNames="numero" ShowHeaderWhenEmpty="true" HeaderStyle-HorizontalAlign="Center" HeaderStyle-BackColor="Gainsboro" HeaderStyle-BorderWidth="2px" RowStyle-BackColor="White"
RowStyle-BorderColor="White" RowStyle-Font-Size="Smaller" RowStyle-Font-Bold="false" CellPadding="3" CellSpacing="0">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnSelect" runat="server" CommandName="Delete" CausesValidation="false" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Numero" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="Nombre" HeaderText="Nombre" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="Identificacion" HeaderText="Identificación" ItemStyle-Width="10%" HeaderStyle-Width="10%" />
<asp:BoundField DataField="Msg" HeaderText="Nombre">
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="ApellidoPaterno" HeaderText="Primer Apellido" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="ApellidoMaterno" HeaderText="Segundo Apellido" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="Contrato" HeaderText="Contrato" />
<asp:BoundField DataField="contratocanal" HeaderText="Contratante" ItemStyle-Width="242px" HeaderStyle-Width="242px">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField DataField="Titular" HeaderText="Usuario Principal">
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="NroDoc" HeaderText="nro_row" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="NroPariente" HeaderText="nro_pariente" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="NroPol" HeaderText="nro_pol" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" HeaderStyle-Width="5px" />
<asp:BoundField DataField="NroAseg" HeaderText="nro_aseg" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="TxtRed" HeaderText="fec_nac" ItemStyle-CssClass="Hides" HeaderStyle-CssClass="Hides" />
<asp:BoundField DataField="Plan" HeaderText="Plan">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
<asp:BoundField DataField="fec_alta" HeaderText="Fecha Ingreso" ItemStyle-Width="96px" HeaderStyle-Width="96px">
<ItemStyle HorizontalAlign="Center" />
</asp:BoundField>
</Columns>
<AlternatingRowStyle BackColor="#f2f2f2" />
</asp:GridView>
</div>
</ContentTemplate>
</asp:UpdatePanel>
aspx.vb (code behind)
RowdataBound
Protected Sub gridDentalNetwork_OnRowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles gridDentalNetwork.RowDataBound
'e.Row.Cells(0).Style("display") = "none"
If e.Row.RowType = DataControlRowType.DataRow Then
e.Row.Attributes("onmouseover") = "this.style.cursor='hand';this.style.textDecoration='underline';"
e.Row.Attributes("onmouseout") = "this.style.textDecoration='none';"
Dim btnSelect As Button = TryCast(e.Row.FindControl("btnSelect"), Button)
btnSelect.CommandArgument = e.Row.RowIndex.ToString()
'e.Row.Attributes("onclick") = String.Format("document.getElementById('{0}').click();", btnSelect.ClientID)
e.Row.Attributes.Add("onclick", "document.getElementById('" & btnSelect.ClientID & "').value = '" & e.Row.RowIndex.ToString() & "'; alert(document.getElementById('" & btnSelect.ClientID & "').value); darClick();")
'e.Row.Attributes.Add("onclick", "var dato = document.getElementById('btnSelect').value; '<%Session['temp']='+ dato +';%>'; alert('<%=Session['temp']%>');")
'e.Row.Attributes("onclick") = String.Format("document.getElementById('{0}').click();", btnSelect.ClientID)
'e.Row.Attributes("onclick") = Page.ClientScript.GetPostBackClientHyperlink(gridDentalNetwork, "Select$" + e.Row.RowIndex.ToString())
'e.Row.Attributes.Add("onclick", String.Format("document.getElementById('{0}').click();", btnSelect.ClientID))
e.Row.ToolTip = "Clic para seleccionar"
End If
End Sub
Method: I am using RowDeleting for commandField.
Protected Sub gridDentalNetwork_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs) Handles gridDentalNetwork.RowDeleting
Dim ListBiored As List(Of MClienteSimple) = New List(Of MClienteSimple)
Dim grvfila As GridViewRow
Dim indexx As String = Session("index")
grvfila = gridDentalNetwork.Rows(e.RowIndex)
Dim lstClientesConf As New MClienteDentalNetwork
lstClientesConf = DirectCast(Session("ClientesConf"), List(Of MClienteDentalNetwork))(grvfila.DataItemIndex)
...etc..etc
End Sub