employeeSheet.setColumnWidth(4, 12 * 256);
final ContentProvider provider = employeeSheet.getContentProvider();
provider.putFormat("STUNDEN", "0.00;[Red]-0.00");
final ExportRow employeeRow = employeeSheet.addRow();
employeeRow.addCell(0, PFUserContext.getLocalizedString("fibu.employee"));
employeeRow.addCell(1, PFUserContext.getLocalizedString("fibu.employee.wochenstunden"));
employeeRow.addCell(2, PFUserContext.getLocalizedString("fibu.employee.sollstunden"));
employeeRow.addCell(3, PFUserContext.getLocalizedString("fibu.employee.iststunden"));
employeeRow.addCell(4, PFUserContext.getLocalizedString("fibu.common.difference"));
// build all column names, title, widths from fixed and variable columns