for (final ViewRiksdagenVoteDataBallotSummary viewRiksdagenVoteDataBallotSummary : ballots) {
                    final HorizontalLayout tabContent = new HorizontalLayout();
                    tabContent.setWidth(100, Unit.PERCENTAGE);
                    tabContent.setHeight(100, Unit.PERCENTAGE);
                    final Tab tab = tabsheet.addTab(tabContent);