Called by the framework when an addin is installed
virtual void OnWorkbookAddinInstall( LPDISPATCH dispWorkbook );
Pointer to dispatch interface of type Excel.Workbook.
This function is called when an addin is installed.
Note that it will only be called if event-sinking is switched on (using CXllApp::SetSinkEvents()).
You can override the method in your application class to react to the event. The default method does nothing.