看看这个:
http://www.foxtable.com/help/topics/0876.htm
变通一下就行:
Dim tab As WinForm.TabControl = e.Form.Controls("TabControl1")
Dim bar As WinForm.NavBar = e.sender
Select Case bar.SelectedPage.ButtonText
Case "页面1"
tab.SelectedIndex = 0
Case "页面2"
tab.SelectedIndex = 1
Case "页面3"
tab.SelectedIndex = 2
End Select