cant get dropdown to fire SelectIndexChanged Event in dropdown in gridview row

I have a dropdown list box as a template field in my gridview, and I can not get it to fire the selectedindexchanged event in my code behind file.

Here is my gridview code:
<ASP:GridView id="MyGridView" runat="server" Width="813px" Font-Size="9pt"      AutoGenerateColumns="False"      AllowPaging="True" AllowSorting="True" DataKeyNames="LeadID" PageSize="500" EmptyDataText="No Referred to Credit for You!!!!!">
    <Columns>    
        <asp:TemplateField HeaderText="Assign To Rep">
        <ItemTemplate>
            <asp:DropDownList ID="ddAssignRep" runat="server" DataSourceID="dsCRRep" AppendDataBoundItems="True" DataTextField="RepWholeName" DataValueField="CreditRepID" AutoPostBack="true" OnSelectedIndexChanged="ddAssignRep_SelectedIndexChanged">
            <asp:ListItem>Assign</asp:ListItem>
            </asp:DropDownList></ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField HeaderText="LoanID" SortExpression="LoanID" Datafield="LoanID" />    
        <asp:BoundField HeaderText="Borrower Name" Datafield="WholeName" />
        <asp:BoundField HeaderText="LO" Datafield="LOAssigned" />    
        <asp:BoundField HeaderText="Date To Credit Repair" Datafield="ReferredRepairDate" />    
        <asp:BoundField HeaderText="Loan Amount" Datafield="PreLoanAmt" />    
        <asp:BoundField HeaderText="Credit Scores" Datafield="CreditScores" />
        <asp:BoundField HeaderText="Your Note" Datafield="RepairRefNotes" />              
        <asp:BoundField HeaderText="Repair Referral Status" Datafield="RepairReferral" />    
    </Columns>  
    <AlternatingRowStyle BackColor="DimGray" />
</ASP:GridView>

Below is my code behind sub.

Protected Sub ddAssignRep_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        MsgBox("testing this")
    End Sub

And I never get the msgbox.  Ca someone clue me in as to why the page is postingback, but the event is not firing?  Is it because I have the page posting pack so it overrides the sub procedure call, and then when he page reloads it does not retain he value, but defaults back to the same index on the dropdown?  I am a bit lost here.  Thanks for any help.
wolfcoopAsked:
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wolfcoopAuthor Commented:
I wrapped the thing in the not postback thingy and that fixed it.  My page load was binding to my grid everytime, thus not changing the index.  I am an idiot, but the ole Not Page.Ispostback fixed it.
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ororioleCommented:
post your Page_Load code so we can take a look at it.
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wolfcoopAuthor Commented:
is it is housed in a master page.  Dont know if that makes any difference.  Here is the page load event of the page.

Sub Page_Load(ByVal Sender As Object, ByVal E As EventArgs) Handles Me.Load

        If Session("UserID") = "" Or IsNothing(Session("UserID")) Then
            Response.Redirect("Login.aspx")
        End If

        objConnect = New SqlConnection()
        objConnect.ConnectionString = ConfigurationManager.ConnectionStrings("VACRMDEVConnectionString").ConnectionString
        Dim strUserName = Session("UserID")
        Dim datDate = Now()

        Dim sqlQuery As String = "SELECT ReferredRepairDate, LeadID, LoanID, LOAssigned, WholeName, PreLoanAmt, RepairReferral, LeadXPN + ', ' + LeadEFX + ', ' + LeadTUC AS [CreditScores], RepairRefNotes From CRMAppLoan WHERE CreditPulledDate >  '4/1/2008 12:00:00 AM'   AND RepairReferral IS NULL AND LoanStatus = 'Credit Repair' Order By LOAssigned"
        myDataAdapter = New SqlDataAdapter(sqlQuery, objConnect)
        'MsgBox(sqlQuery)
        If Not IsNothing(myDataAdapter) Then
            DS = New DataSet()

            myDataAdapter.Fill(DS, "MyGridView")
            Dim Source As DataView = DS.Tables(0).DefaultView
            MyGridView.DataSource = Source
            MyGridView.DataBind()
        End If
    End Sub
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