Adding Events to Custom Classes

You can include your own events in custom classes, and create event procedures that run when those events occur. Creating a custom event is somewhat more complex than creating an event procedure for a built-in event, because your code has to raise the custom event in response to something that happens within the code.

In This Section

• Understanding Custom Events
  When you raise an event, you cause its event procedure to run.
• When Do You Need to Create a Custom Event?
  In many cases, it is not necessary to create a custom event — you can call a procedure to do the same thing.
• Creating Custom Events
  The DataComboBox object wraps a combo box on a form to provide an additional event, the ItemAdded event, which the MSForms ComboBox control does not have.

Related Sections

• Creating Events and Event Procedures
  Take advantage of simple to create events procedures and use ThisDocument, ThisWorkbook, or SheetN objects.
• Creating Event Procedures for Built-in Events by Using the WithEvents Keyword
  The objects for which you have commonly written event procedures — UserForms, Microsoft® Access forms and reports, and the ThisDocument, ThisWorkbook, and SheetN objects — all have an associated class module.