public void refresh() {
        combo.removeAllItems();
        for(Project project : projects.getBusinessObjects()) {
            ((DefaultComboBoxModel<Project>) combo.getModel()).addElement(project);
        }
        if (!projects.getBusinessObjects().isEmpty()) {
            if(project==null) project = projects.getBusinessObjects().get(0);
            combo.setSelectedItem(project);
        }
        if(project!=null) {
            journalDetailsDataModel.setJournal(project.getJournal());
            resultBalanceDataModel.setBalance(project.getResultBalance());
            relationsBalanceDataModel.setBalance(project.getRelationsBalance());
        }
        journalDetailsDataModel.fireTableDataChanged();
        resultBalanceDataModel.fireTableDataChanged();
        relationsBalanceDataModel.fireTableDataChanged();
    }