主题：RecordGrid如何锁定？

   For Each c As Winform.Control In e.Form.Controls

    c.ReadOnly = BooleanEnum.True

Next

2.直接锁定也不行

Dim rgd  As WinForm.RecordGrid = e.Form.Controls("RecordGrid1")

rgd.ReadOnly = BooleanEnum.True

请问如何才能锁定？