平板电脑WPF Windows桌面应用程序 - 滚动问题

I'm running my desktop application WPF on tablet ASUS ME400 Intel Atom Z2760. All working properly, but when I use scrollviewer, scroll movement with finger (abilitate panning mode horizontalOnly) at the end of scroll with finger, the window moves and you see the taskbar for a moment. The effect is not seen if I scroll with my finger, did not arrive until founded in the scrollbar.I'm running my desktop application WPF on table