C#

<br />
<br />
        ' Add column<br />
        textCol = New DataGridTextBoxColumn<br />
        textCol.MappingName = "Binary Value"<br />
        textCol.HeaderText = "BinValue"<br />
        textCol.Width = 160<br />
        ts1.GridColumnStyles.Add(textCol)<br />
        AddHandler textCol.TextBox.KeyPress, AddressOf grdBitfield_keypressHandler<br />
        textCol.TextBox.BackColor = Color.Yellow  'show edit box in yellow color<br />
<br />
<br />
    Private Sub grdBitfield_keypressHandler(ByVal sender As Object, ByVal e As KeyPressEventArgs)<br />
        'handle backspace and delete keys<br />
        If e.KeyChar = Convert.ToChar(Keys.Delete) Then Return<br />
        If e.KeyChar = Convert.ToChar(Keys.Back) Then Return<br />
<br />
        If grdBitfield.CurrentCell.ColumnNumber = 5 Then 'BinValue column<br />
            If Not (e.KeyChar = "0" Or e.KeyChar = "1") Then<br />
                e.Handled = True  'get out immeditely<br />
            End If<br />
        Else<br />
            e.Handled = True<br />
        End If<br />
<br />
    End Sub<br />

class MyEditor : Editor
{
   private additionMember;
   public MyEditor(Editor d)
   {
      //Assign base members here
      baseMember1 = d.baseMember1;
   }
   public int AdditionalMember
   {
     // get and set
   }
}

class MyLookUpedit :LookUpedit
{
   public MyEditor Editor
   {
      get
      {
         MyEditor editor = new MyEditor(base.Properties);
         editor.AdditionalMember = 20;
         return editor;
      }
   }
}