VisualTreeHelper, VisualTreeHelperExtensions และ DataTemplate FrameworkElement.Loaded event http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.frameworkelement.loaded.aspx VisualTreeHelperExtensions http://winrtxamltoolkit.codeplex.com/

Win8DevThaiVisualTreeHelper.MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Markup;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using WinRTXamlToolkit.Controls.Extensions;

namespace Win8DevThaiVisualTreeHelper
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            this.Loaded += MainPage_Loaded;
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            var flipView = this.GetFirstDescendantOfType<FlipView>();
            var scrollViewers = flipView.GetDescendantsOfType<ScrollViewer>();

            foreach (var scrollViewer in scrollViewers)
            {
                scrollViewer.DoubleTapped += (o, dte) => 
                { 
                    // do something 
                };
            }
        }       

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            var template = @"<FlipView xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""><FlipView.ItemTemplate><DataTemplate> <ScrollViewer> <TextBlock Text=""{Binding}""/> </ScrollViewer> </DataTemplate> </FlipView.ItemTemplate></FlipView>";

            var flipView = XamlReader.Load(template) as FlipView;

            flipView.ItemsSource = new[] { "TEST", "TEST2", "TEST3"};

            // in XAML <Grid x:Name="grid"/>
            grid.Children.Add(flipView);
        }
    }
}