public override void AddNewRow()

Public Overrides Sub AddNewRow

using DevExpress.XtraGrid;
using System;
using System.ComponentModel;

namespace SampleGridApplication {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        public Form1() {
            InitializeComponent();
            this.Load += Form1_Load;
            //end-users cannot add rows
            gridView1.OptionsBehavior.AllowAddRows = DevExpress.Utils.DefaultBoolean.False;
        }

        private void Form1_Load(object sender, EventArgs e) {
            //load sample data base
            gridControl1.DataSource = SampleDS();
        }

        private void button1_Click(object sender, EventArgs e) {
            //add a new row
            gridView1.AddNewRow();
            //set a new row cell value. The static GridControl.NewItemRowHandle field allows you to retrieve the added row
            gridView1.SetRowCellValue(GridControl.NewItemRowHandle, gridView1.Columns["Name"], "Please enter new value");
        }

        //sample data source
        public BindingList<Entry> SampleDS() {
            BindingList<Entry> ds = new BindingList<Entry>();
            ds.Add(new Entry("One", 1));
            ds.Add(new Entry("Two", 2));
            ds.Add(new Entry("Three", 3));
            ds.AllowNew = true;
            return ds;
        }
    }

    //sample data source entry
    public class Entry {
        public Entry() { }
        public Entry(string name, Int32 id) {
            Name = name; ID = id;
        }
        public string Name { get; set; }
        public Int32 ID { get; set; }
    }
}

Imports DevExpress.XtraGrid
Imports System
Imports System.ComponentModel

Namespace SampleGridApplication
    Partial Public Class Form1
        Inherits DevExpress.XtraEditors.XtraForm
            Public Sub New()
                InitializeComponent()
                AddHandler Me.Load, AddressOf Form1_Load
                'end-users cannot add rows
                gridView1.OptionsBehavior.AllowAddRows = DevExpress.Utils.DefaultBoolean.False
            End Sub

            Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
                'load sample data base
                gridControl1.DataSource = SampleDS()
            End Sub

            Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs)
                'add a new row
                gridView1.AddNewRow()
                'set a new row cell value. The static GridControl.NewItemRowHandle field allows you to retrieve the added row
                gridView1.SetRowCellValue(GridControl.NewItemRowHandle, gridView1.Columns("Name"), "Please enter new value")
            End Sub

            'sample data source
            Public Function SampleDS() As BindingList(Of Entry)
                Dim ds As New BindingList(Of Entry)()
                ds.Add(New Entry("One", 1))
                ds.Add(New Entry("Two", 2))
                ds.Add(New Entry("Three", 3))
                ds.AllowNew = True
                Return ds
            End Function
    End Class

    'sample data source entry
    Public Class Entry
        Public Sub New()
        End Sub

        Public Sub New(ByVal name As String, ByVal id As Int32)
            Me.Name = name
            Me.ID = id
        End Sub
        Public Property Name() As String
        Public Property ID() As Int32
    End Class
End Namespace

GridView childView = (GridView)view.GetDetailView(e.RowHandle, e.RelationIndex);
childView.AddNewRow();
BeginInvoke(new FocusNewRowDelegate(FocusNewRow), new object[] { childView });

{
    _View.AddNewRow();
    _View.FocusedColumn = _View.VisibleColumns[0];

Dim childView As GridView = CType(view.GetDetailView(e.RowHandle, e.RelationIndex), GridView)
childView.AddNewRow()
BeginInvoke(New FocusNewRowDelegate(AddressOf FocusNewRow), New Object() {childView})

Private Function AddNewRow() As Boolean
    _View.AddNewRow()
    _View.FocusedColumn = _View.VisibleColumns(0)