I have a WebDataGrid where EnableAjax="false."  One of the columns contains an ImageButton, as follows:

<Columns>
                            <ig:BoundDataField DataFieldName="FileName" Key="FileName">
                                <Header CssClass="WebDataGrid_Header" Text="File Name" />
                            </ig:BoundDataField>
                            <ig:TemplateDataField Key="Delete">
                                <ItemTemplate>
                                    <asp:ImageButton ID="imgDelete" OnClick="DeleteClick" CausesValidation="false" CommandName="D"
                                        ImageUrl="~/images/icon_delete.gif" runat="server" />
                                   
                                </ItemTemplate>
                            </ig:TemplateDataField>
                        </Columns>

The Click Event for the image button is as follows:

 protected void DeleteClick(object sender, EventArgs e)
        {

}

But, when I click the button, the event never fires.  Can anyone explain why, and possibly provide a solution?