[WP 8.1] usage of UriMapper in Windows Phone 8.1

Question

Hi,

I have a code sample in Windows Phone 8.0 in my App.xaml page as below.

xmlns:Nav="clr-namespace:System.Windows.Navigation;assembly=Microsoft.Phone"

<Nav:UriMapper x:Key="UriMapper">
                <Nav:UriMapper.UriMappings>
                    <Nav:UriMapping Uri="/SearchExtras" MappedUri="/MainPage.xaml"/>
                </Nav:UriMapper.UriMappings>
            </Nav:UriMapper>

How can i achieve this functionality in Windows Phone 8.1, i tried using Windows.UI.Xaml.Navigation namespace instead of System.windows.navigation namespace but it didn't work out.

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Mohan Rajesh Komatlapalli