private void list(bool forceReload = false)
 {
     if (!_isSeparator)
     {
         if (forceReload || !_isInited || _rootModel.Bounty != null || IsFirstItem)
         {
             if (IsFirstItem)
             {
                 //Exception - "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread."
                 //SubDirectories.Clear();
                 SubDirectories.Load(true);
             }
             SubDirectories.Load(forceReload);
         }
     }
 }