protected static void OnPositionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            OverviewMapWidget me = d as OverviewMapWidget;

            if (me != null)
            {
                me.ResetOverviewPosition((OverviewMapPosition)e.NewValue);
            }
        }
        protected static void OnIsOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            OverviewMapWidget me = d as OverviewMapWidget;

            if (me != null)
            {
                me.ChangeOverviewState((bool)e.NewValue);
            }
        }