Return true if chartType is one of Stock subtypes. Subtypes set corresponds to the appropriate set in Powerpoint see Change Chart Type dialog in Powerpoint HighLowClose OpenHighLowClose VolumeHighLowClose VolumeOpenHighLowClose....to the appropriate set in PowerPoint (see “Change Chart Type”...Type” dialog in PowerPoint): HighLowClose, OpenHighLowClose, VolumeHighLowClose...