private static void LoadConfiguration(MapConfigurationProvider provider)
 {
     if (configuration is object)
     {
         configuration.Cancel();
     }
     configuration    = provider;
     provider.Loaded += new EventHandler <MapConfigurationLoadedEventArgs>(provider_Loaded);
     provider.LoadConfiguration();
 }
 internal static void Reset()
 {
     Loaded = null;
     if (configuration is null)
     {
         return;
     }
     configuration.Loaded -= new EventHandler <MapConfigurationLoadedEventArgs>(provider_Loaded);
     configuration         = null;
 }