page.DataContext not inherited from parent Frame?

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You didn’t specifically ask how you could make this work, only why it doesn’t by default. However, if you do want your Pages to inherit the Frame’s DataContext, you can do this:

In XAML:

<Frame Name="frame"
       LoadCompleted="frame_LoadCompleted"
       DataContextChanged="frame_DataContextChanged"/>

In codebehind:

private void frame_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
    UpdateFrameDataContext(sender, e);
}
private void frame_LoadCompleted(object sender, NavigationEventArgs e)
{
    UpdateFrameDataContext(sender, e);
}
private void UpdateFrameDataContext(object sender, NavigationEventArgs e)
{
    var content = frame.Content as FrameworkElement;
    if (content == null)
        return;
    content.DataContext = frame.DataContext;
}

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