Create dynamic ribbon tabs (MVVM) with static application menu.

Hello, I'm building a main application wich loads extensions (dll) in a ViewModel. Each extension has a Ribbon Tabs collection / ObservableCollection<RibbonTab>.

<Ribbon x:Name="Ribbon" ItemsSource="{Binding Path=tabs}" VerticalAlignment="Top" DockPanel.Dock="Top"></Ribbon>

However, I need to insert a static application menu in the ribbon. I can't put the application menu in the ribbon tag because on ribbonTab binding the collection must be empty.

Any idea please ?

Thank you very much !