public class RibbonRegionAdapter : RegionAdapterBase<Ribbon>
{
    private Ribbon _ribbonTarget;

    public RibbonRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory)
        : base(regionBehaviorFactory)
    {

    }

    protected override void Adapt(IRegion region, Ribbon regionTarget)
    {
        _ribbonTarget = regionTarget;

        region.Views.CollectionChanged += delegate {
            foreach (RibbonTab tab in region.Views.Cast<RibbonTab>())
            {
                if (!_ribbonTarget.Items.Contains(tab))
                {
                    _ribbonTarget.Items.Add(tab);
                }
            }
        };
    }

    protected override IRegion CreateRegion()
    {
        return new SingleActiveRegion();
    }
}

protected override RegionAdapterMappings ConfigureRegionAdapterMappings()
    {
        RegionAdapterMappings mappings = base.ConfigureRegionAdapterMappings();

        if (mappings != null)
        {
            mappings.RegisterMapping(typeof(Ribbon), this.Container.Resolve<RibbonRegionAdapter>());
        }


        return mappings;
    }

<ribbon:RibbonTab x:Class="CarManager.Modules.CarModule.Views.CarRibbonTab"
               xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             Header="Officers">
    <ribbon:RibbonGroup Header="New">

    </ribbon:RibbonGroup>
    <ribbon:RibbonGroup Header="Manage">
        <ribbon:RibbonButton Label="Make"
                                LargeImageSource="..Resourcesmake.png" />
        <ribbon:RibbonButton Label="Inventory"
                                LargeImageSource="..ResourcesInventory.png" />
        <ribbon:RibbonButton Label="Assignments" />
    </ribbon:RibbonGroup>
</ribbon:RibbonTab>

public partial class CarRibbonTab: RibbonTab
{
    public CarRibbonTab()
    {
        InitializeComponent();
    }
}

<ribbon:Ribbon DockPanel.Dock="Top" Title="CarManager" prism:RegionManager.RegionName="RibbonRegion">
    <ribbon:Ribbon.ApplicationMenu>
        <ribbon:RibbonApplicationMenu SmallImageSource="ImagesIcon.png">
            <ribbon:RibbonApplicationMenuItem Header="Exit"
                                              ImageSource="ImagesExitIcon.png"/>
        </ribbon:RibbonApplicationMenu>
    </ribbon:Ribbon.ApplicationMenu>

</ribbon:Ribbon>

public class CarModule: IModule
    {
        private readonly IRegionManager  _regionManager;
        private readonly IUnityContainer _container;
        public MenuItemViewModel MenuItem;

        public CarModule(IUnityContainer container, IRegionManager regionManager)
        {
            _container     = container;
            _regionManager = regionManager;
        }

        public void Initialize()
        {
            //Ribbon
            _container.RegisterType<Object, CarRibbonTab>("CarRibbonTab");

            _regionManager.AddToRegion("RibbonRegion", _container.Resolve<CarRibbonTab>());
        }
    }

var tab1= new Uri("Tab1", UriKind.Relative);
regionManager.RequestNavigate("RibbonRegion", tab1);

var tab2= new Uri("Tab2", UriKind.Relative);
regionManager.RequestNavigate("RibbonRegion", tab2);