https://learn.microsoft.com/pt-pt/dotnet/api/system.componentmodel.design.icomponentchangeservice.componentchanging?view=netframework-4.8.1&viewFallbackFrom=net-9.0
IComponentChangeService.ComponentChanging Event (System.ComponentModel.Design) | Microsoft Learn
Occurs when a component is in the process of being changed.
event systemdesignmicrosoftlearn