void displayVersions(String path) {
      List<PageVersion> pageVersions = pageService.getPageVersions(path);
      if (pageVersions.size() > 0) {
        final ComboBox pageSelection = new ComboBox();
        content.addComponent(pageSelection);
        pageSelection.setNullSelectionAllowed(false);
        pageSelection.setStyleName("version-selection-box");
        pageSelection.setTextInputAllowed(false);

        pageSelection.addValueChangeListener(
            new ValueChangeListener() {
              private static final long serialVersionUID = 1L;

              @Override
              public void valueChange(com.vaadin.data.Property.ValueChangeEvent event) {
                selectedVersion = (PageVersion) pageSelection.getValue();
                if (selectedVersion != null) {
                  Page page =
                      pageService.getPageByVersion(beanItem.getPath(), selectedVersion.getName());
                  page.setPath(beanItem.getPath());
                  previewForm.setBean(page);
                  previewLayout.setTitle(page.getSubject());
                  ((PagePreviewFormLayout) previewLayout).displayPageInfo(page);
                }
              }
            });

        pageSelection.setItemCaptionMode(ItemCaptionMode.EXPLICIT);
        pageSelection.setNullSelectionAllowed(false);

        for (int i = 0; i < pageVersions.size(); i++) {
          PageVersion version = pageVersions.get(i);
          pageSelection.addItem(version);
          pageSelection.setItemCaption(version, getVersionDisplay(version, i));
        }

        if (pageVersions.size() > 0) {
          pageSelection.setValue(pageVersions.get(pageVersions.size() - 1));
        }
      }
    }
  protected void replaceToCombo(String key, Container container, String defaultValue) {
    final TextField field = (TextField) map.get(key);
    HorizontalLayout layout = (HorizontalLayout) field.getParent();
    field.setVisible(false);
    final ComboBox comboBox = new ComboBox("", container);
    comboBox.setImmediate(true);
    comboBox.setNullSelectionAllowed(false);

    comboBox.addValueChangeListener(
        new Property.ValueChangeListener() {
          @Override
          public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
            field.setValue((String) comboBox.getValue());
          }
        });

    if (container.containsId(field.getValue())) {
      comboBox.select(field.getValue());
    } else {
      field.setValue(defaultValue);
      comboBox.select(defaultValue);
    }
    layout.addComponent(comboBox, 1);
  }
  public TaskDashboardViewImpl() {
    this.withMargin(new MarginInfo(false, true, true, true));
    taskSearchPanel = new TaskSearchPanel();
    MHorizontalLayout groupWrapLayout = new MHorizontalLayout();
    groupWrapLayout.setDefaultComponentAlignment(Alignment.MIDDLE_LEFT);

    groupWrapLayout.addComponent(new Label("Filter:"));
    final TaskSavedFilterComboBox savedFilterComboBox = new TaskSavedFilterComboBox();
    savedFilterComboBox.addQuerySelectListener(
        new SavedFilterComboBox.QuerySelectListener() {
          @Override
          public void querySelect(SavedFilterComboBox.QuerySelectEvent querySelectEvent) {
            List<SearchFieldInfo> fieldInfos = querySelectEvent.getSearchFieldInfos();
            TaskSearchCriteria criteria =
                SearchFieldInfo.buildSearchCriteria(TaskSearchCriteria.class, fieldInfos);
            criteria.setProjectid(new NumberSearchField(CurrentProjectVariables.getProjectId()));
            EventBusFactory.getInstance()
                .post(new TaskEvent.SearchRequest(TaskDashboardViewImpl.this, criteria));
          }
        });
    groupWrapLayout.addComponent(savedFilterComboBox);

    groupWrapLayout.addComponent(new Label("Sort:"));
    final ComboBox sortCombo = new ValueComboBox(false, DESCENDING, ASCENDING);
    sortCombo.setWidth("100px");
    sortCombo.addValueChangeListener(
        new Property.ValueChangeListener() {
          @Override
          public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
            String sortValue = (String) sortCombo.getValue();
            if (ASCENDING.equals(sortValue)) {
              sortDirection = SearchCriteria.ASC;
            } else {
              sortDirection = SearchCriteria.DESC;
            }
            queryAndDisplayTasks();
          }
        });
    sortDirection = SearchCriteria.DESC;
    groupWrapLayout.addComponent(sortCombo);

    groupWrapLayout.addComponent(new Label("Group by:"));
    final ComboBox groupCombo =
        new ValueComboBox(false, GROUP_DUE_DATE, GROUP_START_DATE, PLAIN_LIST);
    groupCombo.setWidth("100px");
    groupCombo.addValueChangeListener(
        new Property.ValueChangeListener() {
          @Override
          public void valueChange(Property.ValueChangeEvent valueChangeEvent) {
            groupByState = (String) groupCombo.getValue();
            queryAndDisplayTasks();
          }
        });
    groupByState = GROUP_DUE_DATE;
    groupWrapLayout.addComponent(groupCombo);

    taskSearchPanel.addHeaderRight(groupWrapLayout);

    Button exportBtn = new Button("Export");
    final SplitButton exportSplitBtn = new SplitButton(exportBtn);
    exportBtn.addClickListener(
        new Button.ClickListener() {
          @Override
          public void buttonClick(ClickEvent event) {
            exportSplitBtn.setPopupVisible(true);
          }
        });
    exportSplitBtn.addStyleName(UIConstants.THEME_GREEN_LINK);
    OptionPopupContent popupButtonsControl = new OptionPopupContent();

    Button exportPdfBtn = new Button("PDF");
    exportPdfBtn.setIcon(FontAwesome.FILE_PDF_O);
    FileDownloader pdfFileDownloder = new FileDownloader(buildStreamSource(ReportExportType.PDF));
    pdfFileDownloder.extend(exportPdfBtn);
    popupButtonsControl.addOption(exportPdfBtn);

    Button exportExcelBtn = new Button("Excel");
    exportExcelBtn.setIcon(FontAwesome.FILE_EXCEL_O);
    FileDownloader excelFileDownloader =
        new FileDownloader(buildStreamSource(ReportExportType.EXCEL));
    excelFileDownloader.extend(exportExcelBtn);
    popupButtonsControl.addOption(exportExcelBtn);

    exportSplitBtn.setContent(popupButtonsControl);
    groupWrapLayout.with(exportSplitBtn);

    Button newTaskBtn =
        new Button(
            AppContext.getMessage(TaskI18nEnum.BUTTON_NEW_TASK),
            new Button.ClickListener() {
              private static final long serialVersionUID = 1L;

              @Override
              public void buttonClick(final ClickEvent event) {
                SimpleTask newTask = new SimpleTask();
                newTask.setProjectid(CurrentProjectVariables.getProjectId());
                UI.getCurrent().addWindow(new TaskAddWindow(newTask));
              }
            });
    newTaskBtn.setEnabled(CurrentProjectVariables.canWrite(ProjectRolePermissionCollections.TASKS));
    newTaskBtn.setIcon(FontAwesome.PLUS);
    newTaskBtn.setDescription(AppContext.getMessage(TaskI18nEnum.BUTTON_NEW_TASKGROUP));
    newTaskBtn.setStyleName(UIConstants.THEME_GREEN_LINK);
    groupWrapLayout.addComponent(newTaskBtn);

    Button advanceDisplayBtn = new Button();
    advanceDisplayBtn.setWidth("50px");
    advanceDisplayBtn.setIcon(FontAwesome.SITEMAP);
    advanceDisplayBtn.setDescription(
        AppContext.getMessage(TaskGroupI18nEnum.ADVANCED_VIEW_TOOLTIP));

    Button calendarBtn =
        new Button(
            null,
            new Button.ClickListener() {
              @Override
              public void buttonClick(ClickEvent clickEvent) {
                EventBusFactory.getInstance()
                    .post(new TaskEvent.GotoCalendarView(TaskDashboardViewImpl.this));
              }
            });
    calendarBtn.setWidth("50px");
    calendarBtn.setDescription("Calendar View");
    calendarBtn.setIcon(FontAwesome.CALENDAR);

    Button chartDisplayBtn =
        new Button(
            null,
            new Button.ClickListener() {
              private static final long serialVersionUID = -5707546605789537298L;

              @Override
              public void buttonClick(ClickEvent event) {
                displayGanttChartView();
              }
            });
    chartDisplayBtn.setWidth("50px");
    chartDisplayBtn.setDescription("Display Gantt chart");
    chartDisplayBtn.setIcon(FontAwesome.BAR_CHART_O);

    Button kanbanBtn =
        new Button(
            null,
            new Button.ClickListener() {
              @Override
              public void buttonClick(ClickEvent clickEvent) {
                displayKanbanView();
              }
            });
    kanbanBtn.setWidth("50px");
    kanbanBtn.setDescription("Kanban View");
    kanbanBtn.setIcon(FontAwesome.TH);

    ToggleButtonGroup viewButtons = new ToggleButtonGroup();
    viewButtons.addButton(advanceDisplayBtn);
    viewButtons.addButton(calendarBtn);
    viewButtons.addButton(kanbanBtn);
    viewButtons.addButton(chartDisplayBtn);
    viewButtons.setDefaultButton(advanceDisplayBtn);
    groupWrapLayout.addComponent(viewButtons);

    mainLayout = new MHorizontalLayout().withFullHeight().withFullWidth();
    wrapBody = new MVerticalLayout().withMargin(new MarginInfo(false, true, true, false));
    rightColumn =
        new MVerticalLayout()
            .withWidth("350px")
            .withMargin(new MarginInfo(true, false, false, false));
    mainLayout.with(wrapBody, rightColumn).expand(wrapBody);
  }