async Task LoadUsersInCircle(int circle_id)
{
var list = await _mLearningService.GetUsersInCircle(circle_id);
var userList = new List <user_by_circle_wrapper>();
foreach (var item in list)
{
userList.Add(new user_by_circle_wrapper {
user = item
});
}
UsersList = new ObservableCollection <user_by_circle_wrapper>(userList);
_tmpUsersList = UsersList;
_user_image_manager.Clear();
await UpdateUserImages(0);
}