TranslatesReferenceBoundsIntoBoundary when using custom renderer

I am trying to make some custom renderer with UIKit Dynamics.
If we set TranslatesReferenceBoundsIntoBoundary, to true in a iOS project the boundarys gets colliders and that can stop other elements with colliders.
But how to we do that when making a custom renderer? Du we have boundaries the same way or do we have to define them our self by making a UIView that is the size of the screen?

If we look at this.bounds at ElementChanged and ElementChangedProperty it not set.

Is the size of the bound defined by forms so not every element uses a hole screen?