aurora/Aurora/Frontend/Views/MainView/MainView.xaml.cs

using System;
using System.Collections.ObjectModel;
using System.Linq;
using Aurora.Frontend.Components.NavigationMenu;
using Aurora.Frontend.Views.MainView;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace Aurora.Frontend.Views.Main
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class MainView : MasterDetailPage
    {
        public MainView()
        {
            InitializeComponent();
            BindingContext = new MainViewModel();
            MasterPage.ListView.ItemSelected += ListView_ItemSelected;

            //Set initial view from first item in list
            ObservableCollection<NavigationGroupItem> screenList = (ObservableCollection<NavigationGroupItem>)MasterPage.ListView.ItemsSource;
            var view = (View)Activator.CreateInstance(screenList.FirstOrDefault().FirstOrDefault().TargetType);

            ContentPresenter viewContent = (ContentPresenter)ContentPage.Content.FindByName("ViewContent");
            viewContent.Content = view;
        }

        private void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var item = e.SelectedItem as NavigationItem;
            if (item == null)
                return;

            var view = (View)Activator.CreateInstance(item.TargetType);

            ContentPresenter viewContent = (ContentPresenter)ContentPage.Content.FindByName("ViewContent");
            viewContent.Content = view;

            MasterPage.ListView.SelectedItem = null;
        }
    }

}