No access to MessageBox class in Windows Phone - c#

I'm creating a Windows Runtime App and it seems I don't have any access to the MessageBox class. The documentation states it's in the System.Windows namespace, so I added it and I still don't have access to the MessageBox class.
using System.Windows;
public sealed partial class BillPage : Page
{
private Edge myEdge;
public BillPage()
{
this.InitializeComponent();
MessageBox.Show("Test", "Test");
}
}
Any idea what's up? Am I just an idiot or what?
Documentation: http://msdn.microsoft.com/en-us/library/windowsphone/develop/system.windows.messagebox(v=vs.105).aspx
Full Code:
using EdgeApp.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Graphics.Display;
using Windows.UI.ViewManagement;
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.Navigation;
using System.Windows;
// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkID=390556
namespace EdgeApp
{
public sealed partial class BillPage : Page
{
private NavigationHelper navigationHelper;
private ObservableDictionary defaultViewModel = new ObservableDictionary();
private Edge myEdge;
public BillPage()
{
this.InitializeComponent();
myEdge = new Edge();
this.navigationHelper = new NavigationHelper(this);
this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
}
public NavigationHelper NavigationHelper
{
get { return this.navigationHelper; }
}
public ObservableDictionary DefaultViewModel
{
get { return this.defaultViewModel; }
}
private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
}
private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)
{
}
#region NavigationHelper registration
protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedTo(e);
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedFrom(e);
}
#endregion
private void MessageBoxTest(object sender, RoutedEventArgs e)
{
MessageBox.Show("text");
}
}
}


In Windows Runtime App, MessageBox can be shown by this code:
new MessageDialog("Your Message Content").ShowAsync();

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