Obviously you know when a users clicks your full screen button but a the user can press escape to exit full screen mode at any time, an alternative is to respond to the FullScreenChanged event.

For example:

     public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            App.Current.Host.Content.FullScreenChanged += new EventHandler(FullScreenChanged);
        }

        void FullScreenChanged(object sender, EventArgs e)
        {
            if (App.Current.Host.Content.IsFullScreen)
                txtFullScreen.Text = "Running in full screen.";
            else
                txtFullScreen.Text = "Not running in full screen.";
        }

        private void btnFullScreen_Click(object sender, RoutedEventArgs e)
        {
            App.Current.Host.Content.IsFullScreen = true;
        }
    }

The above assumes a button to enable the user to select full screen and a textblock:

<UserControl x:Class="blog_misc_temp.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" d:DesignWidth="640" d:DesignHeight="480">
  <Grid x:Name="LayoutRoot">
        <StackPanel>
            <TextBlock Name="txtFullScreen" Text="Not running in full screen."/>
            <Button Click="btnFullScreen_Click" Content="Enter Full Screen"></Button>
        </StackPanel>
    </Grid>
</UserControl>

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