I've created a frame with a few pages. The frame has its own journal:

```js
JournalOwnership="OwnsJournal"

```

When I pass 2 pages, I want to clean the frame `NavigationService`:

```js
Frame parent_frame = (Frame)Application.Current.MainWindow.FindName("content_frame");

JournalEntry remove = parent_frame.RemoveBackEntry();

while (parent_frame.NavigationService.CanGoBack) {
    parent_frame.NavigationService.RemoveBackEntry();
    MessageBox.Show("Remove");
}

```

But after cleaning `NavigationService` I can go back.