<riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance my3:pf_company, CreateList=true}" Height="0" LoadedData="pf_companyDomainDataSource_LoadedData" Name="pf_companyDomainDataSource" QueryName="GetPf_companyQuery" Width="0">
            <riaControls:DomainDataSource.DomainContext>
                <my2:UserDomainContext />
            </riaControls:DomainDataSource.DomainContext>
        </riaControls:DomainDataSource>
  <data:DataGrid  
               AutoGenerateColumns="False"              
               IsReadOnly="False" 
               ItemsSource="{Binding ElementName=pf_companyDomainDataSource, Path=Data}"
               Name="dataGrid1" 
               VerticalAlignment = "Stretch" HorizontalAlignment="Stretch" SelectionMode="Single" MouseLeftButtonUp="dataGrid1_MouseLeftButtonUp">
  </data:DataGrid >

       
        //показываем окно редактирования данных пользователей
        private void EditUserData()
        {
            pf_company pf_companyEdit = (dataGrid1.SelectedItem as pf_company);
            if (pf_companyEdit != null)
            {
                UserDataWindow udw = new UserDataWindow(pf_companyEdit.ID_USER);

                udw.Closed += new EventHandler(udw_Closed);
                udw.Title = "Редактирование данных пользователя";
                udw.Show();
            }
        }
       //сохраняем данные после закрытия окна
       void udw_Closed(object sender, EventArgs e)
        {
            UserDataWindow UDW = (UserDataWindow)sender;
            if (UDW.pf_companyDomainDataSource != null)
            {
                if (UDW.pf_companyDomainDataSource.HasChanges)
                {
                    if (UDW.DialogResult == true)
                    {
                        UDW.pf_companyDomainDataSource.SubmitChanges();
                    }
                    else
                    {
                        UDW.pf_companyDomainDataSource.RejectChanges();
                    }
                }                
            }
        }

<data:DataGrid  Grid.Row="1"
               AutoGenerateColumns="False"              
               IsReadOnly="True" 
               ItemsSource="{Binding ElementName=pf_companyDomainDataSource, Path=Data}"
               Name="dataGrid1" 
               VerticalAlignment = "Stretch" HorizontalAlignment="Stretch" SelectionMode="Single" MouseLeftButtonUp="dataGrid1_MouseLeftButtonUp">
                <data:DataGrid.Columns>
                    <data:DataGridTextColumn    CanUserResize="True"
                                                CanUserSort="True" 
                                                Binding="{Binding Path=pf_users.Login}" 
                                                Width="Auto" Header="Имя входа"/>
                    <!--<data:DataGridTextColumn    CanUserResize="True"
                                                CanUserSort="True" 
                                                Binding="{Binding Path=pf_users.Password}" 
                                                Width="Auto" Header="Пароль"/>-->
                    <data:DataGridCheckBoxColumn    CanUserResize="True"
                                                    CanUserSort="True" 
                                                    Binding="{Binding Path=pf_users.IsAdmin}" 
                                                    Width="Auto" Header="Администрор"/>
                    <data:DataGridTextColumn     CanUserResize="True"
                                                     CanUserSort="True" 
                                                     Binding="{Binding Path=name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                                                     Width="Auto" Header="Наименование организации"/>
                    <data:DataGridTextColumn     CanUserResize="True"
                                                     CanUserSort="True" 
                                                     Binding="{Binding Path=INN}" 
                                                     Width="Auto" Header="ИНН"/>
                    <data:DataGridTextColumn     CanUserResize="True"
                                                     CanUserSort="True" 
                                                     Binding="{Binding Path=OGRN}" 
                                                     Width="Auto" Header="ОГРН"/>
                </data:DataGrid.Columns>
            </data:DataGrid>

 // The MetadataTypeAttribute identifies pf_companyMetadata as the class
    // that carries additional metadata for the pf_company class.
    [MetadataTypeAttribute(typeof(pf_company.pf_companyMetadata))]
    public partial class pf_company
    {

        // This class allows you to attach custom attributes to properties
        // of the pf_company class.
        //
        // For example, the following marks the Xyz property as a
        // required property and specifies the format for valid values:
        //    [Required]
        //    [RegularExpression("[A-Z][A-Za-z0-9]*")]
        //    [StringLength(32)]
        //    public string Xyz { get; set; }
        // NotifyPropertyChanged вызовет PropertyChanged когда данные источника изменятся
        // Объявялем событие уведомляющее об измении данных
        
        internal sealed class pf_companyMetadata : INotifyPropertyChanged
        {

            public event PropertyChangedEventHandler PropertyChanged;

            public void EntetyNotifyPropertyChanged(string propertyName)
            {
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
                }
            }  

            // Metadata classes are not meant to be instantiated.
            private pf_companyMetadata() 
            {
            }
            [Display(Name = "Начальник отдела")]
            public string Chief { get; set; }
            [Display(Name = "Электронный адрес начальника отдела")]
            public string ChiefEmail { get; set; }
            [Display(Name = "Телефон начальника отдела")]
            public string ChiefPhone { get; set; }
            [Display(Name = "Директор", Order = 7)]
            public string Director { get; set; }
            [Display(Name = "Электронный адрес директора", Order = 9)]
            public string DirectorEmail { get; set; }
            [Display(Name = "Телефон директора", Order = 8)]
            public string DirectorPhone { get; set; }
            [Display(Name = "Фактический адрес")]
            public string FactAdderss { get; set; }

            public int ID { get; set; }

            public int ID_USER { get; set; }

            public string InformAddress { get; set; }
            [Display(Name = "ИНН", Order = 5)]
            public string INN { get; set; }
            [Display(Name = "Юридический адрес")]
            public string JuristicAdderss { get; set; }
            [Display(Name = "КПП")]
            public string KPP { get; set; }
            [Display(Name = "Наименование организации", Order = 4)]
            public string name {
                                    get { return name; }
                                    set
                                    {
                                        name = value;
                                        // Вызывает NotifyPropertyChanged чтобы уведомить представление об измении данных
                                        EntetyNotifyPropertyChanged("name");
                                    }
                                }
            [Display(Name = "ОГРН", Order = 6)]
            public string OGRN { get; set; }
            
            [Include]
            public pf_users pf_users { get; set; }
            [Display(Name = "Электронный адрес пользователя", Order = 12)]
            public string UserEmail { get; set; }
            [Display(Name = "Имя пользователя", Order = 10)]
            public string UserName { get; set; }
            [Display(Name = "Телефон пользователя", Order = 11)]
            public string UserPhone { get; set; }
            
        }
    }
...