/* implement sorting */
final List<Sort> sorts = (List<Sort>)dataGridState.getSortModel().getSorts();
if(sorts != null && sorts.size() < 2) {
Sort sort = (Sort)sorts.get(0);
SortByProperty sorter = new SortByProperty();
dataSet = sorter.sort(sort, _customers);
}
/* implement filtering */
if(_customerFilterForm != null) {
final List<Filter> filters = _customerFilterForm.getFilters();