Windows8, x86 tablet (Acer w501) and touch screen

I made button in QML with MouseArea, mouse clicks are working well, but when i press button with touch screen MouseArea send onClicked event twice. So there are two same MouseEvents, sometimes with little different x/y. Can't find anything about this problem, and can't resolve it by myself (i am, probably, newbie).

upd: with touchscreen click
first onClicked with mouse.buttons==1 (this is Qt.LeftButton)
second onClicked with mouse.buttons==0

with mouse click
only one onClicked with mouse.buttons==0

so, workaround is
onClicked: {
if(!mouse.buttons) {
//do something

upd2: QtWidgets have same problem. But standart win8 and any other apps haven't this trouble. So, it's probably Qt bug.

upd3: QtGui widgets in Qt 4.8.4 works well, only one pressed/realesed/clicked event.

upd4: It's windows 8 feature, Qt5 needs special mechanics to prevent events doubling.