关于在DataGrid里添加ComboBox（三）

sjDataGridComboBox.cs
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Data;
namespace ComboBoxInDataGrid
{
    public class DataGridComboBox:ComboBox
    {
        //
        // Basic ComboBox used for all ComboBoxes displayes in a datagrid
        //
        public DataGridComboBox()
        {
       //base.DropDownStyle =ComboBoxStyle.DropDownList;
        }
        public DataGridComboBox(DataTable DataSource, string DisplayMember , string ValueMember)
        {
        //    base.DataSource    = DataSource;
        //    base.DisplayMember = DisplayMember;
        //    base.ValueMember = ValueMember;
        //    base.DropDownStyle = ComboBoxStyle.DropDownList;
        }
        public bool isInEditOrNavigateMode = true;