Impossible to change Language of NavigationItems during runtime

I use two ObjectDataProviders in my application based on this project (which I think is a great project) to change the usage language without leaving the runtime. Everything goes well, labels and other controls in my UserControl pages evolve dynamically. Now I want to be able to make my NavigationItem (SubheaderNavigationItem and FirstLevelNavigationItem) evolve when changing the language but I can't use binding in these controls. Is it possible to do it? Thanks a lot.