// Get list of users and add the "All" option at the top
UserVO[] users = getUserService().getAllUsers();
Arrays.sort(users, new UserVOComparator());
List userList = new ArrayList(Arrays.asList(users));
userList.add(0, new UserVO(null, ALL_STRING, null, null));
// Populate submitter and approver dropdowns
form.setSubmitterBackingList(userList, "id", "username");
form.setApproverBackingList(userList, "id", "username");