internal void Add(Frame region)
{
if (String.IsNullOrWhiteSpace(region.Name))
{
throw new ArgumentNullException("Name");
}
if (Navigations.ContainsKey(region.Name))
{
Logger.Technical.From <RegionManager>().System($"A region with name: {region.Name} is already registered.").Log();
throw new DuplcateRegionException(region.Name);
}
Navigations.Add(region.Name, new NavigationService(region));
}