Datagrid控件

'在VB中，MsFlexGrid和DataGrid等控件本来不支持鼠标的滚动操作，但是人性化的设计要求希望这些控件能支持鼠标的各项操作。但是这些控件本身并不自带鼠标的支持参数，必须要自己添加相应的代码。
'本代码需要引用Microsoft ActiveX Data Objects x.0 Library
'添加控件 Microsoft ADO Data Control 6.0
'Microsoft DataGrid Control 6.0
Private Const PM_REMOVE = &H1
Private Type POINTAPI
       x As Long
       y As Long
End Type
Private Type Msg
       hWnd As Long
       Message As Long
       wParam As Long
       lParam As Long
       time As Long
       pt As POINTAPI
End Type
Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" _
           (lpMsg As Msg, _
           ByVal hWnd As Long, _
           ByVal wMsgFilterMin As Long, _
           ByVal wMsgFilterMax As Long, _
           ByVal wRemoveMsg As Long) As Long
Private Declare Function WaitMessage Lib "user32" () As Long
Private bCancel As Boolean
Private Const WM_MOUSEWHEEL = 522
Public RowAA As Integer
Private Sub ProcessMessages()
Dim Message As Msg
       Do While Not bCancel