Touching a WPF button does sometimes not invoke the click handler under Windows 8
问题 "When the application window does NOT have the focus, sometimes the click handler is not called on button-touch." System: Windows 8.1 with a multi-touch input device. Software: A simple WPF 4.5.2 application with just one button that logs if the click handler is called (just create a new project and add a button with a click handler to the MainWindow). Phenomenon: Normally when touching the button its click handler is called. But when the application window does NOT have the focus, sometimes