怎么定制datagridview控件的右键快捷菜单

如何定制datagridview控件的右键快捷菜单？
当焦点位于datagridview控件上的一单无格上时，用右键快捷菜单的复制＼粘贴＼插入一行等等功能，请问这右键快捷菜单如何定制啊？能给出示例代码以供拜读最好，谢谢高手相助！！！

------解决方案--------------------
菜单也是窗体，没有什么，自定义一个菜单式窗体，漂亮到什么程度你自己看着来，
然后再另一个datagridview上右键的时候弹出来就行了，剩下的操作就是，菜单项目鼠标按下的操作了,举个简单的例子
一个窗体，我用4个标签作的菜单
Private Sub Label_MouseLeave(ByVal sender As Object, ByVal e As System.EventArgs)
Dim lb As Label = CType(sender, Label)
lb.BackColor = Color.White
End Sub
Private Sub Label_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Dim lb As Label = CType(sender, Label)
lb.BackColor = Color.Blue
End Sub
Private Sub Form5_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
For Each ctr As Control In Me.Controls
If ctr.GetType.Name = "Label " Then
AddHandler ctr.MouseMove, AddressOf Label_MouseMove
AddHandler ctr.MouseLeave, AddressOf Label_MouseLeave
End If
另一个窗体，在DATAGRIDVIEW上右键时弹出菜单
Private Sub DataGridView1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGridView1.MouseDown
If e.Button = Windows.Forms.MouseButtons.Right Then
Dim F5 As New Form5
F5.Location = New Point(。。。这里要注意的是动态的计算窗体弹出的位置)
F5.Show()
End If
End Sub
Next
End Sub