GridView ItemClick handling

GridView.xaml

<GridView  ItemClick="OnDetailItemClick"
           ItemsSource="{Binding RandomStrings}" />

GridViewWithItemClick.xaml

<GridView IsItemClickEnabled="True"
          ItemClick="OnDetailItemClick" />

MainPage.xaml

<Page
    x:Class="BlogSamples.MainPage"
    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">

    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <GridView x:Name="detailItemsView"
                  IsItemClickEnabled="True"
                  ItemClick="OnDetailItemClick"
                  ItemsSource="{Binding RandomStrings}"
                  SelectedItem="{Binding SelectedString}"
                  SelectionMode="Extended">
        </GridView>
    </Grid>
</Page>

MainPage.xaml.cs

using BlogSamples.ViewModels;
using Windows.UI.Xaml.Controls;

namespace BlogSamples
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            DataContext = new MainPageViewModel(); //ignoring IoC for now
        }

        private void OnDetailItemClick(object sender, ItemClickEventArgs e)
        {
            var vm = (MainPageViewModel) DataContext;
            vm.SelectedString = (string)e.ClickedItem;
        }
    }
}

MainPageViewModel.cs

using System.Collections.ObjectModel;
using System.ComponentModel;

namespace BlogSamples.ViewModels
{
    public class MainPageViewModel : INotifyPropertyChanged
    {
        //...

        public ObservableCollection<string> RandomStrings { get; private set; }

        public string SelectedString
        {
// ... property impl not shown for brevity
        }

        public MainPageViewModel()
        {
            RandomStrings = new ObservableCollection<string>();
            for (int i = 65; i < 98; i++)
            {
                RandomStrings.Add(((char)i).ToString().ToUpper());
            }
        }
    }
}