EDIT

        addContentComponent(workingsetHeader, null);

        registrationListPanel = createRegistrationsList(workingset);

        registrationListPanel.setStyleName("registration-list");

        registrationListPanel.setCaption("Registrations");

        addContentComponent(registrationListPanel, 1.0f);

        registrationsGrid.setComponentAlignment(buttonContainer, Alignment.MIDDLE_RIGHT);

        Panel namesTypesPanel = new Panel(registrationsGrid);

        return namesTypesPanel;

    }