function buildSVG(container) {
            if (!svg) {
                svg = d3Selection.select(container)
                    .append('svg')
                    .classed('britechart grouped-bar', true);

                buildContainerGroups();
            }

            svg
                .attr('width', width)
                .attr('height', height);
        }
@param  {HTMLElement} container DOM element that will work as the container of the graph
@private