https://learn.microsoft.com/fr-fr/dotnet/api/system.windows.uielement.previewstylusinrange?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
UIElement.PreviewStylusInRange Event (System.Windows) | Microsoft Learn
Occurs when the stylus is close enough to the digitizer to be detected, while over this element.
event systemwindowsmicrosoftlearn