Amoeba.Windows.LinkControl._treeView_Collapsed C# (CSharp) Method

        private void _treeView_Collapsed(object sender, RoutedEventArgs e)
        {
            var treeViewItem = e.OriginalSource as TreeViewItem;
            if (treeViewItem == null) return;

            var treeViewModel = (TreeViewModelBase)_treeView.SearchItemFromElement((DependencyObject)treeViewItem);

            var path = new Route();

            foreach (var item in treeViewModel.GetAncestors())
            {
                if (item is SignatureTreeViewModel) path.Add(((SignatureTreeViewModel)item).Value.LinkItem.Signature);
            }

            Settings.Instance.LinkControl_ExpandedPaths.Remove(path);
        }