/// <summary>
/// Handles changes to the FadeTransitioningContentTemplate property.
/// </summary>
/// <param name="d">
/// The <see cref="DependencyObject"/> on which
/// the property has changed value.
/// </param>
/// <param name="e">
/// Event data that is issued by any event that
/// tracks changes to the effective value of this property.
/// </param>
private static async void OnFadeTransitioningContentTemplateChanged(
DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DataTemplate oldFadeTransitioningContentTemplate = (DataTemplate)e.OldValue;
DataTemplate newFadeTransitioningContentTemplate = (DataTemplate)d.GetValue(FadeTransitioningContentTemplateProperty);
await d.FadeOut();
((ContentControl)d).ContentTemplate = newFadeTransitioningContentTemplate;
await d.FadeIn();
}