private void CreateImageBox()
{
DicomUID classUid = DicomUID.BasicGrayscaleImageBoxSOPClass;
if (_session.SessionClassUID == DicomUID.BasicColorPrintManagementMetaSOPClass)
{
classUid = DicomUID.BasicColorImageBoxSOPClass;
}
DicomUID instUid = DicomUID.Generate(SOPInstanceUID, _boxes.Count + 1);
DcmImageBox box = new DcmImageBox(this, classUid, instUid);
box.ImageBoxPosition = (ushort)(_boxes.Count + 1);
_boxes.Add(box);
_dataset.AddReferenceSequenceItem(DicomTags.ReferencedImageBoxSequence, classUid, instUid);
}