<appWeb:myContext x:Key="DomainContext"/>

 protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        this.dfAddRecord.CurrentItem = this.newRecord;
        }

    private void SubmitCompleted(System.ServiceModel.DomainServices.Client.SubmitOperation obj)
        {
            this.biLoading.IsBusy = false;
            if (obj.HasError)
            {
                obj.MarkErrorAsHandled();
                MessageBox.Show(obj.Error.Message);
            }
            else
            {
                MessageBox.Show("obj.Error.Message");
                this.NavigationService.ShowPrevPage();
            }
        }

   private void OnAddClosed(object sender, EventArgs e) // Форма добавления записи
        {
            Child_add add = (Child_add)sender;
            bool? result = add.DialogResult;
            if (result.HasValue && result.Value)
            {
                this.newRecord = new z_plan_name()
                { // Значения полей
                  id= 3 , // Должен увеличиваться автоматически
                    kod_speciality = add.Kod_Box.Text,
                    name = add.Name_Box.Text,
                    delete = "d"
                };
                Add_z();
            }
        }

    private void Add_z()
       {
            if (ResourceWrapper.CurrentDomainContext == null)
            {
                return;
            }
            {
                ResourceWrapper.CurrentDomainContext.z_plan_names.Add(this.newRecord);
                ResourceWrapper.CurrentDomainContext.SubmitChanges(SubmitCompleted, null);
            }
        }

if (this.dfAddRecord.CommitEdit())

       private void SubmitCompleted(System.ServiceModel.DomainServices.Client.SubmitOperation obj)
        {
            this.biLoading.IsBusy = false;
            if (obj.HasError)
            {
                obj.MarkErrorAsHandled();
                MessageBox.Show(obj.Error.Message);
            }
            else
            {
               this.NavigationService.ShowPrevPage();
            }
        }

        private void btnCancelSaveRecord_Click(object sender, RoutedEventArgs e)
        {
            this.NavigationService.ShowPrevPage();
        }

<dxg:GridControl Name="gridControl_Plan" AutoPopulateColumns="False" 
                         DataSource="{Binding ElementName=z_plan_nameDomainDataSource, Path=Data}" 
                         ShowBorder="False" Height="352" VerticalAlignment="Bottom" 
                         Grid.ColumnSpan="2" FilterString="name"  
                         >

   private void AddItem_ItemClick(object sender, ItemClickEventArgs e)
        {
            Child_add add = new Child_add();
            add.Closed += new EventHandler(OnAddClosed);
            add.Show();

        }

        private void OnAddClosed(object sender, EventArgs e)
        {
            Child_add add = (Child_add)sender;
            bool? result = add.DialogResult;
            if (result.HasValue && result.Value)
            {
                this.newRecord = new z_plan_name()
                {
                    kod_speciality = add.Kod_Box.Text,
                    name = add.Name_Box.Text,
                    delete = "d"
                };
                Add_z();
            }
        }

        private void Add_z()
        {
            if (ResourceWrapper.CurrentDomainContext == null)
            {
                return;
            }
            {
                ResourceWrapper.CurrentDomainContext.z_plan_names.Add(this.newRecord);
                ResourceWrapper.CurrentDomainContext.SubmitChanges(SubmitCompleted, null);
            }
        }

                ResourceWrapper.CurrentDomainContext.z_plan_names.Add(this.newRecord);

z_plan_nameDomainDataSource.DataView.Add(this.newRecord);

Add_z();

 z_plan_nameDomainDataSource.DataView.Add(this.newRecord);

ID
 1 
 2 
 3 
 4 
 5 
 6 

ID
 1 
 2 

ID
 1 
 2 
 7 
 8 
....

.................
};
   Add_z();
 z_plan_nameDomainDataSource.DataView.Add(this.newRecord);
}

  
 z_plan_nameDomainDataSource.DataView.Add(this.newRecord);

   private void btnSaveRecord_Click(object sender, RoutedEventArgs e)
        {
            this.ddsCustomer.SubmitChangesAndGoBack(this.NavigationService);
        }

    private void EditRowItem_ItemClick(object sender, ItemClickEventArgs e)
        {
            GridCellMenuInfo menuInfo = Control_Plan.GridMenu.MenuInfo as GridCellMenuInfo;
            if (menuInfo != null && menuInfo.Row != null)
            name_edit = (String)gridControl_Plan.GetFocusedRowCellValue("name");
            kod_speciality_edit = (String)gridControl_Plan.GetFocusedRowCellValue("name");
            kod_speciality_edit = (String)gridControl_Plan.GetFocusedRowCellValue("kod_speciality");
            Child_add add = new Child_add();
            add.Closed += new EventHandler(OnAddClosed);
            add.Kod_Box.Text = kod_speciality_edit;
            add.Name_Box.Text = name_edit;
            add.Show();
        }

<toolkit:DataField Label="Last name">
    <TextBox Text="1111111"/>
</toolkit:DataField>

<controls:ChildWindow xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"  x:Class="SLCBDDSApp.ChildWindow1"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
           Width="400" Height="300" 
           Title="ChildWindow1">
    <Grid x:Name="LayoutRoot" Margin="2">
        <toolkit:DockPanel>
            <toolkit:DockPanel HorizontalAlignment="Right" toolkit:DockPanel.Dock="Top">
                <Button x:Name="btnSaveRecord" Style="{StaticResource ButtonSaveRecordStyle}"  Content="Save_Add" />
                <Button x:Name="btnCancelSaveRecord" Style="{StaticResource ButtonCancelRecordStyle}" />
            </toolkit:DockPanel>

                <toolkit:DataForm x:Name="dfAddRecord" >
                    <toolkit:DataForm.NewItemTemplate>
                        <DataTemplate>
                            <StackPanel>
                                <toolkit:DataField Label="Last name" >
                                 <TextBox Text="1111111"/>
                            </toolkit:DataField>
                            </StackPanel>
                        </DataTemplate>
                    </toolkit:DataForm.NewItemTemplate>
                </toolkit:DataForm>
            </toolkit:DockPanel>
        
        <Button x:Name="CancelButton" Content="Отмена" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0,0" Grid.Row="1" />
        <Button x:Name="OKButton" Content="ОК" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,79,0" Grid.Row="1" />

        </Grid>
</controls:ChildWindow>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SLCBDDSApp
{
    public partial class ChildWindow1 : ChildWindow
    {
        public ChildWindow1()
        {
            InitializeComponent();
        }

        private void OKButton_Click(object sender, RoutedEventArgs e)
        {
            this.DialogResult = true;
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.DialogResult = false;
        }
    }
}

   private void button1_Click(object sender, RoutedEventArgs e)
        {
            ChildWindow1 child = new ChildWindow1();
            child.Show();
        }

    public class PlanAdd
    {
        [Display (Name="Код специальности")]
        public string name { get; set; }
    }

dfAddRecord.CurrentItem = new PlanAdd();

   public partial class Child_Window_Plan : ChildWindow
    {
        private z_plan_name newRecord { get; set; }
        public string Str_Coop, name_edit, kod_speciality_edit;
        public Child_Window_Plan()
        
        {
         InitializeComponent();
         this.newRecord = new z_plan_name();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
          
              dfAddRecord.CurrentItem = this.newRecord;
        }