/// <summary>
/// See if there are changes in an object graph.
/// </summary>
/// <param name="item">Trackable object</param>
/// <returns>True if there are changes in the object graph</returns>
public static bool HasChanges(this ITrackable item)
{
var visitationHelper = new ObjectVisitationHelper();
bool hasChanges = item.HasChanges(visitationHelper,
new Dictionary <ITrackable, bool>(ObjectReferenceEqualityComparer <ITrackable> .Default));
return(hasChanges);
}