private void setStackData()
 {
     this.EnergyHistogramDatumFirst  = SemanticHistogramDatum.GetStackedTimeInstance(this.SelectedSemanticLinks[0], this.TripDirection);
     this.EnergyHistogramDatumSecond = SemanticHistogramDatum.GetStackedTimeInstance(this.SelectedSemanticLinks[1], this.TripDirection);
 }