async Task LoadPostsInCircle(int circle_id)
{
var list = await _mLearningService.GetPostByCircle(circle_id);
PostsList = new ObservableCollection <post_with_username_wrapper>();
foreach (var item in list)
{
PostsList.Add(new post_with_username_wrapper {
post = item
});
}
_post_image_manager.Clear();
await UpdateUserPostImages(0);
}