PageMethods not showing the my function which is declared server-side

Question

I have a function which I defined in the code-behind as follows:

<WebMethod()> _
    Public Shared Function testFunction() As Integer
        Return 0
    End Function

I'm trying to call it using Javascript on the client-side as shown below:

<telerik:RadScriptManager ID="RadScriptManager1" runat="server" EnablePartialRendering="True" EnablePageMethods="True" />
    <div>
        <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server" >
            <script type="text/javascript">
                function ShowEditForm(id, rowIndex) {
                    var grid = $find("<%= RadGrid1.ID %>");
                    PageMethods.
                    var rowControl = grid.get_masterTableView().get_dataItems()[rowIndex].get_element();
                    grid.get_masterTableView().selectItem(rowControl, true);
                    window.radopen("EditFormVB.aspx?TS_ID=" + id, "UserListDialog");
                    return false;
                }
                function ShowViewForm(id, rowIndex) {
                    var grid = $find("<%= RadGrid1.ID %>");

                    var rowControl = grid.get_masterTableView().get_dataItems()[rowIndex].get_element();
                    grid.get_masterTableView().selectItem(rowControl, true);
                    window.radopen("ViewForm.aspx?TS_ID=" + id, "UserListDialog");
                    return false;
                }
                function refreshGrid(arg) {
                    if (!arg) {
                        $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("Rebind");
                    }
                    else {
                        $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("RebindAndNavigate");
                    }
                }
            </script>
        </telerik:RadCodeBlock>

Problem is when I call PageMethods I don't see my function in Intellisense and when I manually call my function PageMethods.testFunction() and try to run the web app, I get an error that it doesn't exist. I have EnablePageMethods set to "True", I'm not sure what I'm missing.