Gets a reference to the SelectionChange event
CXlSelectionChangeEvent& SelectionChangeEvent( );
The function returns a reference to the application's SelectionChange event, which is of type CXlSelectionChangeEvent.
The SelectionChange event is raised when Excel's active cell selection is changed. All registered observers receive the event via the CXlEventObserver::Update method.
When observers are notified, an argument of type CXlRangeEventArgs 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 CXlSelectionChangeEventStaticObserver.