Yes, I was originally thinking that for the Sierra Chart developer too, but a nice effect can be achieved by just switching the length of the comparision period with indicator period.
Then it would be somewhat upside down.

I will try your way, actually it needs to be smoothed, anyway, I will work on it a bit.

it is a nice sample for me to learn more coding and the behaviour of Zorro.

Just I don't get, how I would let the sumDN / sumUP shift, since comparing the complete periods is not so good.
The periods compared should be created by HTDcPeriod / DominantPeriod.