wpf win10 popup位置偏移问题

同样问题参照：

https://stackoverflow.com/questions/18113597/wpf-handedness-with-popups

解决方案：

private static void FixPopupBug()
        {
            var ifLeft = SystemParameters.MenuDropAlignment;
            if (ifLeft)
            {
                var t = typeof(SystemParameters);
                var field = t.GetField("_menuDropAlignment", BindingFlags.NonPublic | BindingFlags.Static);
                field?.SetValue(null, false);
            }

        }

　　启动程序的时候调用下就可以了