[Closed] scripted modifer- get a gizmo \ center controller?

I’m a bit stuck on finding some documentation on this,
I have a scripted modifier, and I want it to have it’s own gizmo \ center.
So that the modifier’s gizmo \ center can be manipulated without affecting the original pivot on the object. Like with for example Xform modifier.

But deriving the modifier from any of those classes with gizmo\center does not make it appear in the scripted modifier.

Do anyone of you know how to do this?