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using System;
using System.Collections;
using System.Collections.Generic;

namespace Flatten
{
    class Program
    {
        static void Main(string[] args)
        {

LuisAlbertoPenaNunez

<?xml version="1.0" encoding="utf-8" ?>
<xf:BottomBarPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Movies.Views.MoviesHomeTabbedPage"
             FixedMode="false"
             BarTheme="DarkWithAlpha"
             xmlns:xf="clr-namespace:BottomBar.XamarinForms;assembly=BottomBar.XamarinForms"
             xmlns:screens="clr-namespace:Movies.Views;assembly=Movies"
             BarTextColor="White"
             BarBackgroundColor="Black">

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protected override void OnInitialized()
{
      InitializeComponent();

      var tabs = CreateTabs();

      NavigationService.NavigateAsync(tabs);
}

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var showingNowTab = $"{KnownNavigationParameters.CreateTab}={nameof(ShowingNow)}";

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private async void OnMovieSelected(Movie movie)
{
      if (movie == null)
          return;

      var navigationParameters = new NavigationParameters();
      navigationParameters.Add(NavigationParametersKey.SelectedMovieId, movie.Id);

      await _navigationService.NavigateAsync($"{nameof(MovieDetails)}", navigationParameters);
}

LuisAlbertoPenaNunez

private async void OnMovieSelected(Movie movie)
{
      if (movie == null)
          return;

      var navigationParameters = new NavigationParameters();
      navigationParameters.Add(NavigationParametersKey.SelectedMovieId, movie.Id);

      await _navigationService.NavigateAsync($"{nameof(MovieDetails)}", navigationParameters);
}

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var showingNowTab = $"{KnownNavigationParameters.CreateTab}={Screens.ShowingNowNavigationPage}|{Screens.ShowingNow}";

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var tabs = $"{Screens.MoviesHomeTabbedPage}?{showingNowTab}&{categoriesTab}&{aboutMeTab}"

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public class Screens
{
        public readonly static string MoviesHomeTabbedPage = nameof(MoviesHomeTabbedPage);

        public readonly static string ShowingNowNavigationPage = nameof(ShowingNowNavigationPage);

        public readonly static string CategoriesNavigationPage = nameof(CategoriesNavigationPage);

        public readonly static string AboutMeNavigationPage = nameof(AboutMeNavigationPage);

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public partial class App : PrismApplication
{
        public App(IPlatformInitializer initializer = null) : base(initializer) { }

        protected override void OnInitialized()
        {
            InitializeComponent();

            var tabs = CreateTabs();