How to bringToBack UIElement behind all other UI?

There is code, but it’s no working properly. This UI Text still placed above menus and other windows.
[pastebin]8ttbbKKg[/pastebin]

AFAIK, there’s only the BringToFront() function and both attributes (front and back) when you focus on the element.

urho3d.github.io/documentation/1 … 738aed7ceb

maybe do an iteration excluding the one you want to sort way back