private static void DirectionPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DropShadowEffect target = ((DropShadowEffect)d);
target.PropertyChanged(DirectionProperty);
}
private static void RenderingBiasPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DropShadowEffect target = ((DropShadowEffect)d);
target.PropertyChanged(RenderingBiasProperty);
}