for (final List<ViewRiksdagenVoteDataBallotPartySummary> partyBallotSummaryList : concernIssuePartyBallotSummaryMap.values()) {
                    final HorizontalLayout tabContent = new HorizontalLayout();
                    tabContent.setWidth(100, Unit.PERCENTAGE);
                    tabContent.setHeight(100, Unit.PERCENTAGE);
                    final Tab tab = tabsheet.addTab(tabContent);