如何在DataGrid中添加ComboBox的方法

有两中方法：
１．修改 ColumnStyles 属性的值.
２．在DataGrid里, 直接贴 Combo 控件. 如:
Public MyCombo As New ComboBox()
    Dim con As New
SqlConnection("server=myservername;uid=myid;pwd=mypassword;database=northwin
d")
    Dim daEmp As New SqlDataAdapter("Select * From Employees", con)
    Public ds As New DataSet()
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
        AddHandler MyCombo.TextChanged, AddressOf Ctrls_TextChanged
        'Fill ComboBox list.
        MyCombo.Name = "MyCombo"
        MyCombo.Visible = False
        MyCombo.Items.Clear()
        MyCombo.Items.Add("Sales Representative")
        MyCombo.Items.Add("Inside Sales Coordinator")
        MyCombo.Items.Add("Vice President, Sales")
        MyCombo.Items.Add("Sales Manager")
        MyCombo.Items.Add("Flunky")
        daEmp.Fill(ds, "Employees")