Hi,

  I'm trying to bind to an observable collection that has a list as one of its properties.  I want the list it to display as a group by when you click the + sign.  The PrimeBrokerAccountItems is the list.  Any help would be appreciated.  Thanks.

        <Custom:XamDataGrid Name="SampleGrid" DataSource="{Binding MasterAccounts, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left" Margin="216,149,0,0" VerticalAlignment="Top">
            <Custom:XamDataGrid.FieldLayoutSettings>
                <Custom:FieldLayoutSettings AutoGenerateFields="False"/>
            </Custom:XamDataGrid.FieldLayoutSettings>
            <Custom:XamDataGrid.FieldLayouts>
                <Custom:FieldLayout IsDefault="true">
                    <Custom:FieldLayout.Fields>
                        <Custom:Field Width= "150" Name="MasterAccountId" Label="Master Account" Row="1"  Column="0"/>
                        <Custom:Field Width= "150" Name="CombinedMargin" Label="Combined Margin" Row="1"  Column="1"/>
                        <Custom:Field Width= "150" Name="AscMargin" Label="Asc Margin" Row="1"  Column="2"/>
                        <Custom:Field Width= "150" Name="PrimeBrokerAccountItems" Label="Account Id" Row="1"  Column="3"/>
                        </Custom:FieldLayout.Fields>
                        </Custom:FieldLayout>
            </Custom:XamDataGrid.FieldLayouts>
        </Custom:XamDataGrid>