Keeping persistence in runtime

Hello everyone,

I have a question regarding keeping persistence in your UI.
In my case, I have 5 pages that each contains a UXML of a TemplateContainer of the same UXML.

This bottom page has 5 buttons that each can be toggled on / off, which, when clicked, changes it's class and display a new page.
Obviously, when I change page, the bottom page state just reset itself.

Would their be any way to keep the data persistent? Keeping the information that I clicked on button 3 for exemple?
Right now I mainly use UI instead of code, but, would spawning that TemplateContainer by code would be better?

I know that viewDataKey exist, but I don't think it works in the case I'm giving.

Thank you for your help.