Изменение mainWindow

MainWindow.xaml

@@ -20,6 +20,6 @@
         <Button x:Name="ButtonBack" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="125" Height="33" Click="ButtonBack_Click">
             <Button Content="Назад" Width="75"/>
         </Button>
-        <Frame Content="MainFrame" Grid.Row="1" Source="/ЯненкоАвторизация;component/Pages/AuthPage.xaml" Navigated="MainFrame_OnNavigated" Grid.RowSpan="2"/>
+        <Frame x:Name="MainFrame" Content="MainFrame" Grid.Row="1" Source="/ЯненкоАвторизация;component/Pages/AuthPage.xaml" Navigated="MainFrame_OnNavigated" Grid.RowSpan="2"/>
     </Grid>
 </Window>