public Node CreateSeparatingSurfuceTreeViewItem(SeparatingSurfuce separatingSurfuce)
 {
     return new Node() { Tag = separatingSurfuce, Title = "Διαχωριστική Επιφάνεια" };
 }
        public void RemoveSeparatingSurfuceFromShell(SeparatingSurfuce separatingSurfuce, Shell shell)
        {
            if (shell.SeparatingSurfuces.Contains(separatingSurfuce))
            {
                shell.SeparatingSurfuces.Remove(separatingSurfuce);
                SaveBuildingData();
                _action = e =>
                {
                    if (e == null) StatusBar.Display("o χώρος διαγράφηκε");
                };
                Model.DataAccesLayerService.SaveChanges(_action);

            }
        }
 private object CreateSeparatingSurfuceTreeViewItem(SeparatingSurfuce separatingSurfuce)
 {
     return new TreeViewItem() { Tag = separatingSurfuce, Header = "Διαχωριστική Επιφάνεια" };
 }