Формирование и отрисовка Bollingerband

private BaseIndicator _priceIndicator = new BollingerBand(new KaufmannAdaptiveMovingAverage() {Length = 4}, new StandardDeviation() {Length = 10});

var indicatorElem = new ChartIndicatorElement()
{
    Title = "Boilinger Band",
    Indicator = _priceIndicator as BollingerBand,
    Color = Colors.AliceBlue
};
if (_priceIndicator.IsFormed)
{
    el = _indicatorElem;
    BollingerBand bandToDisplay = el.Indicator as BollingerBand;
    Chart.Draw(timeFrameCandle.OpenTime, new Dictionary<IChartElement, object>
    {
        { _candleElem, timeFrameCandle },
        { _indicatorElem, bandToDisplay.GetCurrentValue<IIndicator>()}
    });
}