https://learn.microsoft.com/en-us/dotnet/api/system.windows.contentelement.previewtouchup?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
ContentElement.PreviewTouchUp Event (System.Windows) | Microsoft Learn
Occurs when a finger is raised off of the screen while the finger is over this element.
event systemwindowsmicrosoftlearn