Basic question on deleting from EntityGridView

I think I'm missing something really basic here.

I have an entity gridview bound to a typed datasource- this is the generated admin page using 13/Nov/06 nightly templates. The entity has multiple foreign keyed relations. Nothing happens when I select delete. Its obviously choking on the foreign key colections. So my question is how do I perform a delete from an entitygridview- along with any FK relations. The only changes i have made to the generated code is I removed some of the bound columns to better suit the admin interface.

Thanks

 
Ben 

 Code follows:

 
     <data:GridViewSearchPanel runat ="server" ID="SearchPanel" GridViewControlID="GridView1" BusinessEntityType="FTS.Entities.Hotels" />   
        <data:EntityGridView ID="GridView1" runat="server"           
            AutoGenerateColumns="False"                   
            OnSelectedIndexChanged="GridView_SelectedIndexChanged"
            DataSourceID="HotelsDataSource"
            DataKeyNames="HotelID"
            AllowMultiColumnSorting="false"
            DefaultSortColumnName=""
            DefaultSortDirection="Ascending"   
            ExcelExportFileName="Export_Hotels.xls"
            AllowExportToExcel="true"                
            >
            <Columns>
                <asp:CommandField ShowSelectButton="True" ShowEditButton="True" showDeleteButton="true" />               
                <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName"  />
                <asp:BoundField DataField="HotelCode" HeaderText="HotelCode" SortExpression="HotelCode"  />
                <asp:TemplateField HeaderText="DestinationID">
                <ItemTemplate>
                        <asp:Repeater ID="DestinationID1" runat="server" DataSourceID="DestinationsFilter1">
                            <ItemTemplate>
                                <%# Eval("DestinationName") %>
                            </ItemTemplate>
                        </asp:Repeater>

                        <data:EntityDataSourceFilter ID="DestinationsFilter1" runat="server"
                            DataSourceID="DestinationsDataSource1"
                            Filter='<%# String.Format("DestinationID = {0}", Eval("DestinationID")) %>'
                        />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="HotelRating" HeaderText="HotelRating" SortExpression="HotelRating"  />
                <asp:checkboxfield DataField="IsLive" HeaderText="IsLive" SortExpression="IsLive"  />
                <asp:checkboxfield DataField="FeatureOnHomePage" HeaderText="FeatureOnHomePage" SortExpression="FeatureOnHomePage"  />
            </Columns>
            <EmptyDataTemplate>
                <b>No Hotels Found!</b>
            </EmptyDataTemplate>
        </data:EntityGridView>
        <br />
        <asp:Button runat="server" ID="btnHotels" OnClientClick="BLOCKED SCRIPTlocation.href='/FTS/admin/HotelsEdit.aspx'; return false;" Text="Add New"></asp:Button>
           
        <data:DestinationsDataSource ID="DestinationsDataSource1" runat="server"
            SelectMethod="GetAll"
        />
        <data:MetrosDataSource ID="MetrosDataSource2" runat="server"
            SelectMethod="GetAll"
        />
        <data:MetrosDataSource ID="MetrosDataSource3" runat="server"
            SelectMethod="GetAll"
        />
        <data:HotelsDataSource ID="HotelsDataSource" runat="server"
            SelectMethod="GetPaged"
            EnablePaging="True"
            EnableSorting="True"
        >
            <Parameters>
                <data:CustomParameter Name="WhereClause" Value="" ConvertEmptyStringToNull="false" />
                <data:CustomParameter Name="OrderByClause" Value="" ConvertEmptyStringToNull="false" />
                <asp:ControlParameter Name="PageIndex" ControlID="GridView1" PropertyName="PageIndex" Type="Int32" />
                <asp:ControlParameter Name="PageSize" ControlID="GridView1" PropertyName="PageSize" Type="Int32" />
                <data:CustomParameter Name="RecordCount" Value="0" Type="Int32" />
            </Parameters>
        </data:HotelsDataSource>