<Window.Resources>
        <local:Ds x:Key="ds"/>
        <CollectionViewSource x:Key="dgnTypeViewSource" Source="{Binding DgnType, Source={StaticResource     
    </Window.Resources>
    <DockPanel >
        <ListView x:Name="typeListView" DataContext="{StaticResource dgnTypeViewSource}"  ItemsSource="{Binding}" Margin="3">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <DockPanel>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition/>
                                <RowDefinition/>
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition/>
                            </Grid.ColumnDefinitions>
                            <Label Grid.Row="0" Content="{Binding Path=Type}" />
                            <!--вот тут главная собака зарыта. Path - это связь между таблицами-->
                            <ListView Grid.Row="1" ItemsSource="{Binding Path=DgnType_DgnTest}" BorderThickness="0">
                                <ListView.ItemTemplate>
                                    <DataTemplate>
                                        <Label  Content="{Binding Path=Test}"/>
                                    </DataTemplate>
                                </ListView.ItemTemplate>
                            </ListView>
                        </Grid>
                    </DockPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </DockPanel>