gridview sorting not working correctly

I am using a grdview control and I have enabled sorting however when I click on the sort hyperlink in the title column it never calls the GridView1_Sorting routine.  Pretty much nothing happens, there is no post back.  What else do I need to enable to get post back to work.

When I hover over the link it says "javascript:__doPostBack('GridView1','Sort$Employee_id ASC')

(I have not included the sorting routine, however when I put a debug breakpoint on the sorting or selected indexchanged routine they are never called.

What am I missing?
<asp:GridView ID="GridView1" runat="server" CellPadding="4" 
            EnableModelValidation="True" ForeColor="#333333" GridLines="None" 
            AutoGenerateColumns="False" AllowSorting="True" 
            OnSorting="gridView1_Sorting" AutoGenerateSelectButton="False" 
            AutoGenerateEditButton="False" AllowPaging="True" PageSize="999">
        <AlternatingRowStyle BackColor="White" Font-Bold="True" ForeColor="#000000"  HorizontalAlign="Center" />
        <EditRowStyle BackColor="#999999" />
        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" Font-Size="Small" />
        <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#E3E0D7" ForeColor="#000000" Font-Size="Small" Font-Bold="True" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#D9D3CA" Font-Bold="True" ForeColor="#000000" />
                                                    <asp:BoundField DataField="employee_id" HeaderText="Emp #" 
                                                            HtmlEncode="False" HtmlEncodeFormatString="False" ItemStyle-HorizontalAlign="Left" SortExpression="employee_id ASC" />


    Public Sub GridView1_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles GridView1.Sorting
        Dim m_DataTable As DataTable = GridView1.DataSource

    End Sub

    Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles GridView1.SelectedIndexChanged
        Dim m_DataTable As DataTable = GridView1.DataSource

    End Sub

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Who is Participating?
Paul JacksonConnect With a Mentor Software EngineerCommented:
remove the following setting from the gridview definition it is specifying that you want to use client-side callbacks to handle the sorting and therefore the server postback won't happen:
Paul JacksonSoftware EngineerCommented:
How are you binding the gridview to a datasource. It would be useful if you could post this code.
TedgClAuthor Commented:
During page load I call a SQL procedure which builds a table.  I then create a dataview and bind that to the gridview.
So the databind event is called during page_load.

Dim dv As DataView = New DataView(PTable)
                GridView1.DataSource = dv

However there is no postBack ever called when the sort buttons are clicked.
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