// -------------------------------------------------------------------
 /// Folds all visible items.
 void FoldAllVisible()
 {
     database.ForEach(
         l => {
         if (ShouldShow(l))
         {
             if (!(l is LibraryTypeMember))
             {
                 myTreeView.Fold(l);
             }
         }
     }
         );
 }
 // ---------------------------------------------------------------------------------
 public void FoldSelected()
 {
     if (Selected == null)
     {
         return;
     }
     myTreeView.Fold(Selected);
 }