Adding new rows to a table via updatepanel

Hi,

I have a button which when pressed adds a new row to a table using updatepanel (without page reload). It adds the first row fine, however it never adds anymore rows after that and it seems that it always ever thinks that there is one row. I thought about using a viewState to record the rowCount and do table.controls.addAt(viewState("rowCount"), newRow) but this doesnt work either.

Behind VB code:

Protected Sub addResponseRow(ByVal sender As Object, ByVal e As System.EventArgs) Handles addResponses_btn.Click
        Dim rowCount = options_tbl.Rows.Count

        Dim newRow = New TableRow
        debug_tb.Text = rowCount 'This is always ever showing as 1 and not the correct row numbers'

        Dim newCell_checkbox = New TableCell
        newCell_checkbox.CssClass = "optionRemover"
        Dim newCheckbox = New CheckBox
        newCheckbox.CssClass = "chk"
        newCell_checkbox.Controls.Add(newCheckbox)
        newRow.Controls.Add(newCell_checkbox)


        Dim newCell_label = New TableCell
        newCell_label.CssClass = "optionNumber"
        Dim newLabel = New Label
        newLabel.Text = rowCount + 1
        newCell_label.Controls.Add(newLabel)
        newRow.Controls.Add(newCell_label)



        Dim newCell_textbox = New TableCell
        newCell_textbox.CssClass = "optionValues"
        Dim newTextbox = New TextBox
        newTextbox.MaxLength = 100
        newTextbox.Width = "350"
        newCell_textbox.Controls.Add(newTextbox)
        newRow.Controls.Add(newCell_textbox)

        Dim newCell_radio = New TableCell
        newCell_radio.CssClass = "optionExclusive"
        Dim newRadio = New RadioButton
        newRadio.GroupName = "optionGroup"
        newRadio.ID = "radio_Option_" & rowCount
        newCell_radio.Controls.Add(newRadio)
        newRow.Controls.Add(newCell_radio)

        options_tbl.Controls.AddAt(rowCount, newRow)
    End Sub

<asp:ScriptManager ID="ScriptManager1" runat="server" ></asp:ScriptManager><asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate><asp:button ID="addResponses_btn" runat="server" text="Add Row" style="margin-left:30px;" CausesValidation="false"/>   <asp:table runat="server" cellpadding="0" cellspacing="0"  id="options_tbl" style="border:1px solid #ccc; font-size:inherit;"><asp:TableRow>                                    <asp:TableCell CssClass="optionRemover"><asp:CheckBox runat="server" CssClass="chk"/> </asp:TableCell><asp:TableCell CssClass="optionNumber"><asp:label runat="server">1</asp:label></asp:TableCell><asp:TableCell CssClass="optionValues"><asp:TextBox onBlur="checkRangeChange()" MaxLength="100" runat="server" Width="350px"></asp:TextBox></asp:TableCell><asp:TableCell CssClass="optionExclusive"><asp:RadioButton GroupName="optionGroup" id="radio_Option"  runat="server"/></asp:TableCell></asp:TableRow></asp:table></ContentTemplate>   <Triggers>                        <asp:AsyncPostBackTrigger ControlID="addResponses_btn" EventName="click" /></Triggers></asp:UpdatePanel>

Any ideas?

Thank you :)