<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfTest" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="WpfTest.MainWindow"
        Title="MainWindow" Height="542.933" Width="784.717" Loaded="Window_Loaded_1">
    <Window.Resources>
        <local:MainDataSet x:Key="mainDataSet"/>
        <CollectionViewSource x:Key="customerViewSource" Source="{Binding Customer, Source={StaticResource mainDataSet}}"/>
        <CollectionViewSource x:Key="customerOrderViewSource" Source="{Binding Customer_Order, Mode=TwoWay, Source={StaticResource customerViewSource}}"/>
        <CollectionViewSource x:Key="orderViewSource" Source="{Binding Order, Source={StaticResource mainDataSet}}"/>
    </Window.Resources>

    <Grid DataContext="{StaticResource customerViewSource}">
        <Button Content="Add" HorizontalAlignment="Left" Margin="10,432,0,0" VerticalAlignment="Top" Width="757" Height="71" Click="Button_Click_1"/>
        <DataGrid x:Name="customerDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding}" Margin="10,10,367,303" RowDetailsVisibilityMode="VisibleWhenSelected">
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="fullNameColumn" Binding="{Binding FullName}" Header="Full Name" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="numColumn" Binding="{Binding Num}" Header="Num" Width="SizeToHeader"/>
            </DataGrid.Columns>
        </DataGrid>
        <DataGrid x:Name="orderDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding Source={StaticResource customerOrderViewSource}}" Margin="415,10,10,303" RowDetailsVisibilityMode="VisibleWhenSelected">
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="dateColumn" Binding="{Binding Date}" Header="Date" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="numColumn1" Binding="{Binding Num}" Header="Num" Width="SizeToHeader"/>
            </DataGrid.Columns>
        </DataGrid>
        <DataGrid x:Name="orderDataGrid1" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding Source={StaticResource orderViewSource}}" Margin="10,227,367,86" RowDetailsVisibilityMode="VisibleWhenSelected">
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="dateColumn1" Binding="{Binding Date}" Header="Date" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="numColumn2" Binding="{Binding Num}" Header="Num" Width="SizeToHeader"/>
            </DataGrid.Columns>
        </DataGrid>

    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfTest
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainDataSet mainDataSet;
        int count = 0;
        
        public MainWindow()
        {
            InitializeComponent();
        }

        void Customer_RowChanged(object sender, DataRowChangeEventArgs e)
        {
            Console.WriteLine("Строка изменена " + e.Action.ToString() +"  "+ e.Row[0]);
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            DataRow newDataRow = mainDataSet.Customer.NewRow();
            newDataRow[0] = count;
            mainDataSet.Customer.Rows.Add(newDataRow);
            count++;
        }


        private void Window_Loaded_1(object sender, RoutedEventArgs e)
        {
            mainDataSet = ((WpfTest.MainDataSet)(this.FindResource("mainDataSet")));
            mainDataSet.Customer.RowChanged += Customer_RowChanged;
        }
    }
}