Gets a reference to the WorkbookOpen event
CXlWorkbookOpenEvent& WorkbookOpenEvent( );
The function returns a reference to the application's WorkbookOpen event, which is of type CXlWorkbookOpenEvent.
The WorkbookOpen event is raised when a workbook is opened. All registered observers receive the event via the CXlEventObserver::Update method.
When observers are notified, an argument of type CXlWorkbookEventArgs is passed.
Observers can register for this event at any point in the life of the XLL. Registration can be done explicitly using Register, or automatically by creating an instance of CXlWorkbookOpenEventStaticObserver.