Chart Does not display

Hi

I cant see it but in therea trigger that actuially renders the data. I have
1) seriesViewModel.Add(new ChartSeriesViewModel(rangeSeries.priceSeries, new FastOhlcRenderableSeries()));

2) update my priceSeries(t,o,h,l,c) with a whole bunch of bars but nothing is plotting

extract from the rangeSeries class

class RangeSeries
{
double rangeSize;
bool firstTickReceived;

    double nextTop;
    double nextBot;

    DateTime T;
    double O;
    double C;
    double H;
    double L;

    public OhlcDataSeries priceSeries;

    public RangeSeries(double s)
    {
        rangeSize = s;
        firstTickReceived = false;

        priceSeries = new OhlcDataSeries();
    } 

Thanks

Paul