RecordContainer runAtomsParent = _headerAtom.getParentRecord();
// Add the new StyleTextPropAtom after the TextCharsAtom / TextBytesAtom
Record addAfter = _byteAtom;
if(_byteAtom == null) { addAfter = _charAtom; }
runAtomsParent.addChildAfter(_styleAtom, addAfter);
// Feed this to our sole rich text run
if(_rtRuns.length != 1) {
throw new IllegalStateException("Needed to add StyleTextPropAtom when had many rich text runs");
}