/// <summary>
/// Handles changes to the IsEnabled 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 OnIsEnabledChanged(
DependencyObject d, DependencyPropertyChangedEventArgs e)
{
bool oldIsEnabled = (bool)e.OldValue;
bool newIsEnabled = (bool)d.GetValue(IsEnabledProperty);
if (!d.IsInVisualTree())
await ((FrameworkElement)d).WaitForLoadedAsync();
var listBoxItem =
d as ListBoxItem ??
d.GetAncestors().OfType<ListBoxItem>().FirstOrDefault();
if (listBoxItem == null)
return;
//throw new InvalidOperationException("ListBoxItemExtensions.IsEnabled can only be set on a ListBoxItem or its descendant in the visual tree");
listBoxItem.IsEnabled = newIsEnabled;
}