using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
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.Media;
using Windows.UI.Xaml.Media.Animation;
using Windows.UI.Xaml.Navigation;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227

namespace Vera
{
	/// <summary>
	/// Provides application-specific behavior to supplement the default Application class.
	/// </summary>
	public sealed partial class App : Application
	{
#if WINDOWS_PHONE_APP
		private TransitionCollection transitions;
#endif

		/// <summary>
		/// Initializes the singleton application object.  This is the first line of authored code
		/// executed, and as such is the logical equivalent of main() or WinMain().
		/// </summary>
		public App()
		{
			this.InitializeComponent();
			this.Suspending += this.OnSuspending;
		}

		/// <summary>
		/// Invoked when the application is launched normally by the end user.  Other entry points
		/// will be used when the application is launched to open a specific file, to display
		/// search results, and so forth.
		/// </summary>
		/// <param name="e">Details about the launch request and process.</param>
		protected override void OnLaunched(LaunchActivatedEventArgs e)
		{
#if DEBUG
			if (System.Diagnostics.Debugger.IsAttached)
			{
				this.DebugSettings.EnableFrameRateCounter = true;
			}
#endif

			Frame rootFrame = Window.Current.Content as Frame;

			// Do not repeat app initialization when the Window already has content,
			// just ensure that the window is active
			if (rootFrame == null)
			{
				// Create a Frame to act as the navigation context and navigate to the first page
				rootFrame = new Frame();

				// TODO: change this value to a cache size that is appropriate for your application
				rootFrame.CacheSize = 1;

				if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
				{
					// TODO: Load state from previously suspended application
				}

				// Place the frame in the current Window
				Window.Current.Content = rootFrame;
			}

			if (rootFrame.Content == null)
			{
#if WINDOWS_PHONE_APP
				// Removes the turnstile navigation for startup.
				if (rootFrame.ContentTransitions != null)
				{
					this.transitions = new TransitionCollection();
					foreach (var c in rootFrame.ContentTransitions)
					{
						this.transitions.Add(c);
					}
				}

				rootFrame.ContentTransitions = null;
				rootFrame.Navigated += this.RootFrame_FirstNavigated;
#endif

				// When the navigation stack isn't restored navigate to the first page,
				// configuring the new page by passing required information as a navigation
				// parameter
				if (!rootFrame.Navigate(typeof(MainPage), e.Arguments))
				{
					throw new Exception("Failed to create initial page");
				}
			}

			// Ensure the current window is active
			Window.Current.Activate();
		}

#if WINDOWS_PHONE_APP
		/// <summary>
		/// Restores the content transitions after the app has launched.
		/// </summary>
		/// <param name="sender">The object where the handler is attached.</param>
		/// <param name="e">Details about the navigation event.</param>
		private void RootFrame_FirstNavigated(object sender, NavigationEventArgs e)
		{
			var rootFrame = sender as Frame;
			rootFrame.ContentTransitions = this.transitions ?? new TransitionCollection() { new NavigationThemeTransition() };
			rootFrame.Navigated -= this.RootFrame_FirstNavigated;
		}
#endif

		/// <summary>
		/// Invoked when application execution is being suspended.  Application state is saved
		/// without knowing whether the application will be terminated or resumed with the contents
		/// of memory still intact.
		/// </summary>
		/// <param name="sender">The source of the suspend request.</param>
		/// <param name="e">Details about the suspend request.</param>
		private void OnSuspending(object sender, SuspendingEventArgs e)
		{
			var deferral = e.SuspendingOperation.GetDeferral();

			// TODO: Save application state and stop any background activity
			deferral.Complete();
		}
	}
}

using Microsoft.Practices.Prism.Mvvm;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227

namespace Vera
{
	/// <summary>
	/// Provides application-specific behavior to supplement the default Application class.
	/// </summary>
	public sealed partial class App : MvvmAppBase
	{
		/// <summary>
		/// Initializes the singleton application object.  This is the first line of authored code
		/// executed, and as such is the logical equivalent of main() or WinMain().
		/// </summary>
		public App()
		{
			this.InitializeComponent();
		}
	}
}

protected override Task OnLaunchApplicationAsync(LaunchActivatedEventArgs args)
{
	NavigationService.Navigate("Start", null);
	return Task.FromResult<object>(null);
}

<StackPanel Orientation="Horizontal">
	<AppBarButton Icon="Folder"/>
	<TextBlock VerticalAlignment="Center" FontSize="21">Browse</TextBlock>
</StackPanel>

<StackPanel Margin="0,14,0,13" VerticalAlignment="Top">
	<Grid HorizontalAlignment="Center" Height="40" Margin="0,0,0,5" Width="40">
		<Ellipse x:Name="BackgroundEllipse" Fill="{ThemeResource AppBarItemBackgroundThemeBrush}" Height="40" UseLayoutRounding="False" Width="40"/>
		<Ellipse x:Name="OutlineEllipse" Height="40" Stroke="{ThemeResource AppBarItemForegroundThemeBrush}" StrokeThickness="2" UseLayoutRounding="False" Width="40"/>
		<ContentPresenter x:Name="Content" AutomationProperties.AccessibilityView="Raw" Content="{TemplateBinding Icon}" Foreground="{TemplateBinding Foreground}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
	</Grid>
	<TextBlock x:Name="TextLabel" Foreground="{ThemeResource AppBarItemForegroundThemeBrush}" FontSize="12" FontFamily="{TemplateBinding FontFamily}" TextAlignment="Center" TextWrapping="Wrap" Text="{TemplateBinding Label}" Width="88"/>
</StackPanel>

<Button x:Name="backButton" Margin="39,59,39,0" Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}"
			Style="{StaticResource NavigationBackButtonNormalStyle}"
			VerticalAlignment="Top"
			AutomationProperties.Name="Back"
			AutomationProperties.AutomationId="BackButton"
			AutomationProperties.ItemType="Navigation Button"/>