private static void VerifyReadOnlyProperty(DependencyProperty dependencyProperty, DependencyPropertyKey dependencyPropertyKey)
{
if (dependencyProperty.IsReadOnly &&
(dependencyPropertyKey == null || dependencyPropertyKey.DependencyProperty != dependencyProperty || !DependencyProperty.IsValidReadOnlyKey(dependencyPropertyKey)))
{
throw new Granular.Exception("Can't modify the read-only dependency property \"{0}\" without its key", dependencyProperty);
}
}