IfcDoc.FormEdit.SortType C# (CSharp) Méthode

        private void SortType()
        {
            TreeNode tn = this.treeView.SelectedNode;
            DocType docType = (DocType)tn.Tag;

            DocSchema docSchema = (DocSchema)tn.Parent.Parent.Tag;
            int indexOld = docSchema.Types.IndexOf(docType);
            docSchema.SortTypes();
            int indexNew = docSchema.Types.IndexOf(docType);
            if (indexNew != indexOld)
            {
                TreeNode tnParent = tn.Parent;
                tn.Remove();
                tnParent.Nodes.Insert(indexNew, tn);
                this.treeView.SelectedNode = tn;
            }
        }