Page.FormulaChanged Event (Visio)
Occurs after a formula changes in a cell in the object that receives the event.
If you're using Microsoft Visual Basic or Visual Basic for Applications (VBA), the syntax in this topic describes a common, efficient way to handle events.
If you want to create your own Event objects, use the Add or AddAdvise method. To create an Event object that runs an add-on, use the Add method as it applies to the EventList collection. To create an Event object that receives notification, use the AddAdvise method. To find an event code for the event you want to create, see Event codes.
You can use VBA WithEvents variables to sink the FormulaChanged event.
For performance considerations, the Document object's event set does not include the FormulaChanged event. To sink the FormulaChanged event from a Document object (and the ThisDocument object in a VBA project), you must use the AddAdvise method.