MahApps.Metro.Behaviours.StylizedBehaviors.OnPropertyChanged C# (CSharp) Method

        private static void OnPropertyChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
        {
            var uie = dpo as FrameworkElement;
            if (uie == null)
            {
                return;
            }

            var newBehaviors = e.NewValue as StylizedBehaviorCollection;
            var oldBehaviors = e.OldValue as StylizedBehaviorCollection;
            if (newBehaviors == oldBehaviors)
            {
                return;
            }

            BehaviorCollection itemBehaviors = Interaction.GetBehaviors(uie);

            uie.Unloaded -= FrameworkElementUnloaded;

            if (oldBehaviors != null)
            {
                foreach (var behavior in oldBehaviors)
                {
                    int index = GetIndexOf(itemBehaviors, behavior);
                    if (index >= 0)
                    {
                        itemBehaviors.RemoveAt(index);
                    }
                }
            }

            if (newBehaviors != null)
            {
                foreach (var behavior in newBehaviors)
                {
                    int index = GetIndexOf(itemBehaviors, behavior);
                    if (index < 0)
                    {
                        var clone = (Behavior)behavior.Clone();
                        SetOriginalBehavior(clone, behavior);
                        itemBehaviors.Add(clone);
                    }
                }
            }

            if (itemBehaviors.Count > 0)
            {
                uie.Unloaded += FrameworkElementUnloaded;
            }
            uie.Dispatcher.ShutdownStarted += Dispatcher_ShutdownStarted;
        }