private static void OnBehaviorsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BehaviorCollection oldBehaviors = (BehaviorCollection)e.OldValue;
if (oldBehaviors != null && ((IAttachedObject)oldBehaviors).AssociatedObject == d)
{
oldBehaviors.Detach();
}
BehaviorCollection newBehaviors = (BehaviorCollection)e.NewValue;
if (newBehaviors != null)
{
FrameworkElement element = FrameworkElement.FindTreeElement(newBehaviors);
if (element != null && !element.IsInitialized)
{
// assigned from a template, collection must be cloned
d.SetValue(BehaviorsProperty, newBehaviors.Clone());
}
else
{
newBehaviors.Attach(d);
}
}
}