public MainViewModel()
{
this.Items = new ObservableCollectionWithItemNotification<ItemViewModel>();
_friends = new ObservableCollection<FriendViewModel>();
GroupedItems = _friends.GroupFriends();
streamUpdater = new Timer(streamUpdater_Tick, null, Timeout.Infinite, Timeout.Infinite);
//We do not start the updater here. It will be started by the callback of the reponse
//Warning: Possible issue where a internet conenction is not stable
loadData();
loadFriends();
}