In earlier versions of Access, clicking the tab did not do anything. I do not suggest using the Page's click event but when creating a tab control in 2010 and using a tab control in 2010 you can fire code like the following when clicking the Tab Control.
Code:
Private Sub tabTest_Click()
Dim intTab As Integer
intTab = Me.tabTest.Value
Select Case intTab
Case 0
MsgBox "1"
Case 1
MsgBox "2"
Case 2
MsgBox "3"
Case Else
MsgBox "Error"
End Select
End Sub
Another option is to use the On Change Event to fire the code. This works on earlier versions as well.
As for the recordsource thing. I am not aware of the tab control, itself, having a recordsource property.