trigger on MarketSeries Data resize eg. scroll to past causing reload

Hi, RE: when a user scrolls to the first index bar and cTrader refreshes the data size all the existing relative draw lines become out of sequence. For the most part i have hacked a solution with a Chart.ScrollChanged function and by tracking the last known total bar size via OnBar. However this inherits a bug/issue where a user can quickly scroll to the first index then back to the last bar before cTrader updates the data size (i know most wont do this but the case is still possible).

        private void Chart_ScrollChanged(ChartScrollEventArgs obj)
        {

            if (Plot && 2 < (Chart.BarsTotal - Chart.LastVisibleBarIndex) && Chart.BarsTotal > Chart_BarsTotal)
            {
                Chart_BarsTotal = Chart.BarsTotal;
            }
            else
            {
                return;
            }

            //code here will only be executed if the user doesnt scroll back to the last bar
            // before cTrader updates to the new data size
        }

is there a nicer way to handle datasize being updated? eg. user scrolling to first bar causing market data to be updated?

cheers