<prism:PrismApplication
     x:Class="WpfPrism.App"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:prism="http://prismlibrary.com/">

     <Application.Resources>
     </Application.Resources>

</prism:PrismApplication>

using Prism.Ioc;
using Prism.Unity;
using System.Windows;

namespace WpfPrism
{
     public partial class App : PrismApplication
     {
          protected override void RegisterTypes(IContainerRegistry containerRegistry)
          {
               containerRegistry.RegisterForNavigation<MainWindow, ViewModels.MainWindowViewModel>();
               containerRegistry.RegisterForNavigation<FilmsView, ViewModels.FilmsViewModel>();
               containerRegistry.RegisterForNavigation<BooksView, ViewModels.BooksViewModel>();
          }

          protected override Window CreateShell()
          {
               return Container.Resolve<MainWindow>();
          }
     }
}

using Prism.Mvvm;

namespace WpfPrism.ViewModels
{
     public class MainWindowViewModel : BindableBase
     {
          public MainWindowViewModel()
          {
          }
     }
}

using Prism.Mvvm;

namespace WpfPrism.ViewModels
{
     public class FilmsViewModel : BindableBase
     {
          public string FilmNames { get; set; }

          public FilmsViewModel()
          {
               FilmNames = "My films: Star Wars, Rockkie";
          }

     }
}

using Prism.Mvvm;

namespace WpfPrism.ViewModels
{
     public class BooksViewModel : BindableBase
     {
          public string BookNames { get; set; }

          public BooksViewModel()
          {
               BookNames = "My books: book1, book2";
          }

     }
}

<UserControl x:Class="WpfPrism.FilmsView"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          mc:Ignorable="d"
          xmlns:prism="http://prismlibrary.com/"
          prism:ViewModelLocator.AutoWireViewModel="True"
          Height="450" Width="800">

     <Grid>
          <TextBlock Text="{Binding FilmNames}"></TextBlock>
     </Grid>

</UserControl>

using System.Windows.Controls;

namespace WpfPrism
{
     public partial class FilmsView : UserControl
     {
          public FilmsView()
          {
               InitializeComponent();
          }
     }
}

<UserControl x:Class="WpfPrism.BooksView"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          mc:Ignorable="d"
          xmlns:prism="http://prismlibrary.com/"
          prism:ViewModelLocator.AutoWireViewModel="True"
          Height="450" Width="800">

     <Grid>
          <TextBlock Text="{Binding BookNames}"></TextBlock>
     </Grid>

</UserControl>

using System.Windows.Controls;

namespace WpfPrism
{
     public partial class BooksView : UserControl
     {
          public BooksView()
          {
               InitializeComponent();
          }
     }
}

<Window x:Class="WpfPrism.MainWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          xmlns:mvvm="http://prismlibrary.com/"
          mc:Ignorable="d"
          xmlns:prism="http://prismlibrary.com/"
          prism:ViewModelLocator.AutoWireViewModel="True"
          Title="MainWindow" Height="450" Width="800">

     <Grid>
          <TabControl>
               <TabItem Header="Books">
                    <ContentControl mvvm:RegionManager.RegionName="BooksRegion"></ContentControl>
               </TabItem>

               <TabItem Header="Films">
                    <ContentControl mvvm:RegionManager.RegionName="FilmsRegion"></ContentControl>
               </TabItem>
          </TabControl>
     </Grid>

</Window>

using System.Windows;
using Prism.Regions;

namespace WpfPrism
{
     public partial class MainWindow : Window
     {
          public MainWindow(IRegionManager regionManager)
          {
               InitializeComponent();

               regionManager.RegisterViewWithRegion("FilmsRegion", typeof(FilmsView));
               regionManager.RegisterViewWithRegion("BooksRegion", typeof(BooksView));
          }
     }
}

using System.Windows;
using Prism.Regions;

namespace WpfPrism
{
     public partial class MainWindow : Window
     {
          public MainWindow(IRegionManager regionManager)
          {
               InitializeComponent();

               Loaded += (sender, routedEventArgs) =>
               {
                    regionManager.RequestNavigate("FilmsRegion", new Uri(nameof(FilmsView), UriKind.Relative), new NavigationParameters() /*parameters*/);
                    regionManager.RequestNavigate("BooksRegion", new Uri(nameof(BooksView), UriKind.Relative), new NavigationParameters() /*parameters*/);
               };
          }
     }
}