drag and drop grouping does not work for GridTemplateColumn

[Curt Helland]

I have a grid bound to a sql data source. there are gridbound columns and gridtemplatecolumns. an example of each column is shown below. in this example, the drag and drop grouping will work for the AddressLine2 gridboundcolumn but not for the City gridtemplatecolumn.  As you can see, Groupable is set true and the template column has a GroupByExpression of City but when I drop it, no grouping occurs. what else do I need to do to make this work?

                        <telerik:GridBoundColumn DataField="AddressLine2" HeaderText="AddressLine2" SortExpression="AddressLine2"
                            UniqueName="AddressLine2" AutoPostBackOnFilter="True">
                        </telerik:GridBoundColumn>
                        <telerik:GridTemplateColumn HeaderText="City" DataField="City" SortExpression="City"
                            Groupable="true" GroupByExpression="City" UniqueName="CityColumn" AutoPostBackOnFilter="True">
                            <EditItemTemplate>
                                <telerik:RadComboBox ID="CityEditControl" runat="server" Skin="Web20" DataSourceID="lkpCities"
                                    DataTextField="City" DataValueField="UID" SelectedValue='<%# Bind("lkpCitiesID")%>'
                                    MarkFirstMatch="true" AppendDataBoundItems="true">
                                    <Items>
                                        <telerik:RadComboBoxItem Text="Select" Value="0" />
                                    </Items>
                                </telerik:RadComboBox>
                            </EditItemTemplate>
                            <ItemTemplate>
                                <%#Eval("City")%>
                            </ItemTemplate>
                        </telerik:GridTemplateColumn>

[Martin]

Hello Curt Helland,

I would suggest that you review the section titled "Tempalte columns" section in the following help article:

Declarative definition

I hope this helps,
Martin
the Telerik team

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[Shantanu]

Thanks a lot. The link really helps...

Just to reply to the answer straight away

GroupByExpression="Group By TitleID"

NOT 

GroupByExpression="TitleID"

also, you do not need to say
Groupable="true"

Its true by default.
I hope it helps,
Shantanu Chandra