Gridview, Autogenerated Column, Checkbox Column Editable

I have a gridview binded to a datasource.

 <asp:GridView ID="DocumentReviewGrid" runat="server" AllowPaging="True" AllowSorting="True"
                    EnableModelValidation="True" Width="100%" BorderStyle="None" 
                    CssClass="docnav_data" BorderWidth="1px" GridLines="None" DataSourceID="DocumentReviewDataSource"
                    HorizontalAlign="Left" OnRowDataBound="DocumentReviewGrid_RowDataBound" 
                    OnRowCreated="DocumentReviewGrid_RowCreated" CellSpacing="5"
                    PageSize="20" OnPageIndexChanged="DocumentReviewGrid_PageIndexChanged">
                    <AlternatingRowStyle BackColor="#EBF2F9" BorderStyle="None" />
                    <FooterStyle HorizontalAlign="Left" />
                    <HeaderStyle BackColor="#E7E7E7" HorizontalAlign="Left" />
                    <PagerSettings Mode="NumericFirstLast" Position="Top" PageButtonCount="4" />
                    <PagerStyle HorizontalAlign="Center" />                       
                </asp:GridView>

As you can see Autogenerated Column is set to true, and it must be kept like that. One of the column is a SQL bit value, so it's represented as checkbox. I would like to be able to edit the checkbox column only, without using "AutoGenerateEditButton" property. I would just like to:

• be able to check/uncheck the checkbox (I am stuck here)
• performin a single update using an external button