Windows 10 Dialog Button
https://forum.qt.io/topic/ 87387/wm_lbuttondown-no- produce-qmouseevent-after- last-windows-10-update/6
https://stackoverflow.com/ questions/18359903/missing-wm- lbuttondown-under-windows-8- touchscreen?rq=1
windows 10 can not get LButtonDown by touch
Dlg::OnTouch( WPARAM wParam, LPARAM lParam )