xml

<TabControl ItemsSource="{Binding Source={StaticResource data}}" Name="tabControl1">
                    <TabControl.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding XPath=Nome}"/>
                        </DataTemplate>
                    </TabControl.ItemTemplate>
                    <TabControl.ContentTemplate>
                        <DataTemplate>
                            <DataGrid ItemsSource="{Binding XPath=Cadeiras/Cadeira}" AutoGenerateColumns="False" x:Name="dg1" CanUserAddRows="True">
                                <DataGrid.Columns>
                                    <DataGridCheckBoxColumn Header="Activa" Binding="{Binding XPath=Activa}"/>
                                    <DataGridTextColumn Header="Nome" Binding="{Binding XPath=Nome}"/>
                                    <DataGridTextColumn Header="Nota" Binding="{Binding XPath=Nota}"/>
                                </DataGrid.Columns>
                            </DataGrid>
                        </DataTemplate>
                    </TabControl.ContentTemplate>
                </TabControl>