htmlGroup (htmlSection) {
        logger.warnOnce('consider using dataGrid.htmlSection instead of dataGrid.htmlGroup for clarity');
        if (!arguments.length) {
            return this.htmlSection();
        }
        return this.htmlSection(htmlSection);
    }
Backward-compatible synonym for {@link DataGrid#htmlSection htmlSection}.
@param {Function} [htmlSection]
@returns {Function|DataGrid}