public async void OnTick(IWeiboAccessToken at)
        {
            if (_tick++%57 != 0)
                return;
            var resp = await WeiboClient.suggestions_statuses_hot_async(at.get(), 20, true, 1, _type);
            if(++_type == hot_status_type.count)
                _type = hot_status_type.musement;

            if (resp.Failed() || resp.Value.Length == 0)
                return;
            var queue = new PriorityQueue<long, Status>();
            foreach(var s in resp.Value)
            {
                queue.Enqueue(EvalMark(s),s);
            }
            while (queue.Size > 5)
                queue.Dequeue();
            while(!queue.IsEmpty)
            {
                var s = queue.Dequeue();
                var ws = new WeiboStatus();
                ws.assign_sina(s);
                await DispatcherHelper.UIDispatcher.BeginInvoke(DispatcherPriority.SystemIdle, (Action) (() =>
                {
                    if(statuses.Count > 10)
                        statuses.RemoveAt(0);
                    statuses.Add(ws);
                }));
            }
        }
        internal void ReloadSinaV2(Statuses result,bool reload )
        {
            previous_cursor = result.previous_cursor;
            next_cursor = result.next_cursor;
            total_number = result.total_number;
            Debug.WriteLine("noti: {3}, timeline total: {0},prev: {1},next: {2}",total_number,previous_cursor, next_cursor, notifications);

            if(reload)
                UiInvoke(() => statuses.Clear());
            foreach (var s in result.statuses)
            {
                var ws = new WeiboStatus();
                ws.assign_sina(s);
                UiInvoke(() => statuses.Add(ws));
            }
        }