Asp.Net and the single file model, update panel

Question

Wasn't sure if this should be in the asp.net or the ajax specific forum...

I have used the control kit without any problems on the 2 file model.

I am currently having to work with someone that started a project in the single file model. I am wanting to use some of the same functionality that I have used in the 2 file model but it is doing a full postback.

<asp:UpdatePanel ID="upGridIssues" runat="server">
            <Triggers>
            </Triggers>
            <ContentTemplate>
                <asp:DropDownList ID="ddlGameIssueTypes" runat="server" 
                    OnSelectedIndexChanged="ddlGameIssueTypes_SelectedIndexChanged" 
                    AutoPostBack="True">
                    <asp:ListItem Selected="True">Select Issue Type</asp:ListItem>
                    <asp:ListItem>Account Issue</asp:ListItem>
                    <asp:ListItem>Functionality</asp:ListItem>
                    <asp:ListItem>Game Glitch</asp:ListItem>
                    <asp:ListItem>Page Error</asp:ListItem>
                    <asp:ListItem>Suggestion</asp:ListItem>
                </asp:DropDownList>
                <asp:GridView ID="gvIssues" runat="server" HeaderStyle-CssClass="HeaderStyle" RowStyle-CssClass="RowStyle"
                    AlternatingRowStyle-CssClass="AltRowStyle" EditRowStyle-CssClass="EditRowStyle"
                    PagerStyle-CssClass="PagerStyle" AllowPaging="True" AllowSorting="False" AutoGenerateColumns="false"
                    CssClass="GridViewStyle" GridLines="Horizontal" PageSize="20">
                    <Columns>
                        <asp:CommandField ShowSelectButton="true" SelectText="Edit" />
                        <asp:BoundField DataField="Message" HeaderText="Message" SortExpression="Message">
                            <ItemStyle Width="650px" />
                        </asp:BoundField>
                        <asp:BoundField DataField="User" HeaderText="User" SortExpression="User">
                            <ItemStyle Width="200px" />
                        </asp:BoundField>
                        <asp:BoundField DataField="Date" HeaderText="Date" SortExpression="Date">
                            <ItemStyle Width="150px" />
                        </asp:BoundField>
                        <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status">
                            <ItemStyle Width="75px" />
                        </asp:BoundField>
                    </Columns>
                </asp:GridView>
            </ContentTemplate>
        </asp:UpdatePanel>

 
No matter what i can not get the single file model to do this asynchronously, it always reloads the page fully. 
Is it possible to do it in the single file model or am I doing something wrong?