https://learn.microsoft.com/fr-fr/dotnet/api/system.windows.iinputelement.stylusbuttondown?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-9.0
IInputElement.StylusButtonDown Event (System.Windows) | Microsoft Learn
Occurs when the stylus button is pressed while the stylus is over this element.
event systemwindowsmicrosoftlearn