Wpf Navigate MVVM

I have this frame Window Home.xaml

<StackPanel Orientation="Horizontal" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
          <StackPanel x:Name="LinksStackPanel" Orientation="Horizontal" >
          </StackPanel>
          <Frame Name="FrameWithinGrid" Source="Views/PricipalPage.xaml" NavigationUIVisibility="Hidden" Margin="0,52,0,0"  />
      </StackPanel>

private void mainMenu_Click(object sender, RoutedEventArgs e)
       {
           MenuItem mi = (MenuItem)e.OriginalSource;
           node a = mi.DataContext as node;
           this.FrameWithinGrid.Navigate(new Uri(a.ruta, UriKind.Relative));
       }

I have a menu from which the pages of this post so far everything works

When I have loaded a page I want to push this website is directed to another page, but this switch is connected to a command viewmodel
this is the viewmodel

public class RentarInmueblesViewModel : ViewModelBase
    {

public RentarInmueblesViewModel()
       {

}
       //public string txtFiltro { get; set; }
       private ICommand _SelectInmueblesCommand;
       public ICommand SelectInmueblesCommand
       {
           get
           {
               if (_SelectInmueblesCommand == null)
               {
                   _SelectInmueblesCommand = new DelegateCommand(SelectInmuebles);
               }
               return _SelectInmueblesCommand;
           }
       }
      <pre lang="cs">private void SelectInmuebles()

{

Here I would go the code addresses to another page

}
}
}




concerned with

NavigationService.Navigate(new Uri("/Views/ClientesAgenciasPage.xaml", UriKind.Relative));

but without any resltado
I asked a lot and did not find any way to do

this