public void execute(Event<UIUserSelector> event) throws Exception {
UIUserSelector uiForm = event.getSource();
String keyword = uiForm.getUIStringInput(FIELD_KEYWORD).getValue();
String filter = uiForm.getUIFormSelectBox(FIELD_FILTER).getValue();
String groupId = uiForm.getSelectedGroup();
uiForm.search(keyword, filter, groupId);
if (filter == null || filter.trim().length() == 0) return;
event.getRequestContext().addUIComponentToUpdateByAjax(uiForm);
}
