/// <summary>
        /// Handles a change to the Content property.
        /// </summary>
        private static void OnContentChanged(object element, DependencyPropertyChangedEventArgs e)
        {
            Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - OnContentChanged Entry");
            TransitionElement te = element as TransitionElement;

            if (te != null)
            {
                ContentPresenter contentPresenter = te.Content as ContentPresenter;
                FrameworkElement parentFE         = te.Parent as FrameworkElement;
                Debug.WriteLineIf(TraceSwitches.Transitions.TraceVerbose, "TransitionElement - OnContentChanged Beginning Transition");
                te.BeginTransition();
            }
        }