private void SkilledNodesOnCollectionChanged(object sender, CollectionChangedEventArgs <SkillNode> args)
        {
            if (_treeJewelViewModels is null)
            {
                return;
            }

            foreach (var node in args.RemovedItems)
            {
                _treeJewelViewModels.ApplyIfPresent(node.Id, j => j.IsEnabled = false);
            }
            foreach (var node in args.AddedItems)
            {
                _treeJewelViewModels.ApplyIfPresent(node.Id, j => j.IsEnabled = true);
            }
        }