private static void OnVerticalOffsetPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MapTip dp = d as MapTip;
int dY = (int)e.NewValue - (int)e.OldValue;
dp.SetValue(Canvas.TopProperty, Canvas.GetTop(dp) + dY);
}
private static void OnHorizontalOffsetPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MapTip dp = d as MapTip;
int dX = (int)e.NewValue - (int)e.OldValue;
dp.SetValue(Canvas.LeftProperty, Canvas.GetLeft(dp) + dX);
}