private void btnDeleteLine_Click(object sender, RoutedEventArgs e)
        {
            if (LineType == LineType.NestedObjectOpening || (LineType == LineType.DeletedLine && typeBeforeDelete == LineType.NestedObjectOpening))
            {
                var args = new LineEventArgs();
                args.LineNumber       = LineNumber;
                args.OriginalLineType = LineType;

                InnerDocumentDelete?.Invoke(this, args);
            }
            else
            {
                if (!LineKey.Equals("_id"))
                {
                    SetLineAsDeleted();
                }
            }
        }