调用Api,发送消息,可以,以前vb中用的
Private Const BM_CLICK As Long = &HF5
Private Declare Function SendMessage Lib "user32.dll" Alias "PostMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, ByVal lParam As Int32) As Boolean
If e.KeyCode = Keys.PageUp Then
SendMessage(Me.TaxCustomButton.Handle, BM_CLICK, 0, 0)
End If