Occurs when any workbook is activated.
Private Sub app_WorkbookActivate(ByVal Wb As Workbook)
app An object of type Application declared with events in a class module. For more information, see Using Events with the Application Object.
Wb The activated workbook.
Example
This example arranges open windows when a workbook is activated.
Private Sub App_WorkbookActivate(ByVal Wb As Workbook)
Application.Windows.Arrange xlArrangeStyleTiled
End Sub