z_plan_name newItem = new z_plan_name()
                {
//Наименование столбцов в таблице
                        id = - 1 ,
                        kod_speciality = add.Kod_Box.Text, 
                        name = add.Name_Box.Text,
                        delete="d",
                };
                
                 z_plan_nameDomainDataSource.DataView.Add(newItem);
                 z_plan_nameDomainDataSource.SubmitChanges();

Control_Plan.DeleteRow(menuInfo.Row.RowHandle.Value);

<riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance my:z_plan_name, CreateList=true}" 
                                      Height="0" LoadedData="z_plan_nameDomainDataSource_LoadedData" 
                                      Name="z_plan_nameDomainDataSource" QueryName="GetZ_plan_nameQuery" Width="0" Margin="0,0,478,250"
                                      >
            <riaControls:DomainDataSource.DomainContext>
                <my:myContext />
            </riaControls:DomainDataSource.DomainContext>

z_plan_name newItem = new z_plan_name()
                {
                    id =  2 ,
                    kod_speciality = add.Kod_Box.Text,
                    name = add.Name_Box.Text,
                    delete = "d",
                };
                z_plan_nameDomainDataSource.DataView.Add(newItem);
                z_plan_nameDomainDataSource.SubmitChanges();

     z_plan_nameDomainDataSource.DataView.Add(newItem);

if (z_plan_nameDomainDataSource.Data == null)
                    return;

                var dataList = z_plan_nameDomainDataSource.Data.Cast<z_plan_name>().ToList();

                // найти запись
                var oneRecord = dataList.Where(r => r.id ==  1 ).FirstOrDefault();

z_plan_nameDomainDataSource.DataView.Add(oneRecord);

dataList.Remove(oneRecord);

private myContext context;

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

namespace SLCBDDSApp
{
    public class ResourceWrapper
    {
        public static SLCBDDSAppWeb.DBDomainContext CurrentDomainContext
        {
            get
            {
                return Application.Current.Resources["DomainContext"] as SLCBDDSAppWeb.DBDomainContext;
            }
        }
    }
}