Using a ButtonBox instead of a Notebook?

[Bachsau <web bachsau name>]

Hi, I'm currently developing an app that uses two panes in its main 
window, each containing a "TreeView". Now it shall be capable of showing 
the contents of several different files in tabs. But using a "Notebook" 
would require me to have a distinct copy of the "Paned" and "TreeView" 
widgets on every page of the Notebook. I don't really like that and had 
the idea of using a "ButtonBox" with radio buttons instead, which just 
swap the "ListStore"s displayed by the "TreeView"s.

What do you think of this idea and is there a way to make the radio 
buttons look like default "Notebook" tabs?

Thanks in advance,
Bachsau