Resolved Plans of adding css feature "z-index"?

Currently working in UI Toolkit to create a UI for a stack of papers. When selecting a button that goes to the next page, I want the top page to move to the bottom and reveal the page underneath.

I can do this in css by changing the z-index. I have yet to find an equivalent option on Unity's Visual Elements.

I am looking at using Sort Order on the UI Document, but I am hoping I do not need to make a separate UI document for each page.

If I am missing something please let me know. Otherwise I hope a feature like this will be added soon.

 

Found my own solution in Visual Element's documentation. I can use Hierarchy to do everything. There are also four methods that can do quick movement in the Hierarchy (PlaceBehind, PlaceInFront, SendToBack, and BringToFront)