I have yet to see a model where the trim tabs or control surfaces show ANY change due to trimming adjustments. That is not to say that it doesn't exist but I personally haven't seen it.
I suspect it is just being done computationally (for example, minute adjustments of "htail incidence") in the aircraft.cfg file would be one approach. Some +/- computational offset to the zero position of the control surface throws would be another method.
However, you wouldn't see that occurring visually.