private void StartDrag(TileSystem system)
 {
     DragAndDrop.PrepareStartDrag();
     DragAndDrop.objectReferences = new Object[] { system };
     DragAndDrop.paths            = new string[0];
     DragAndDrop.StartDrag(TileLang.FormatDragObjectTitle(system.name, typeof(TileSystem).Name));
 }