How to custom renderer for WPF from forms toolbaritems

I am creating an application using xf. On the windows platform, we are using WPF. The secondary toolbar overlays the title and is horizontally displayed. I would like to make the secondary menu display vertically. (Image attached)

I have attempted to create a CustomNavigationPageRenderer.
At this point I am unable to determine how to access the ToolBarItems and have them display vertically.

[assembly: ExportRenderer(typeof(CustomNavigationPage), typeof(CustomNavigationPageRender))]
namespace SDPNativeClient.WPF
{
    public class CustomNavigationPageRender: NavigationPageRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<NavigationPage> e)
        {
            base.OnElementChanged(e);
            var x = e;
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if (e.PropertyName.Equals("Renderer")) {
                var x = this.Control;
            }

            //var page = this.Element as NavigationPage;

            //if (page != null && _toolbar != null)
            //{
            //  Typeface tf = Typeface.CreateFromAsset(Android.App.Application.Context.Assets, "MyFont.ttf");

            //  TextView title = (TextView)_toolbar.FindViewById(Resource.Id.toolbar_title);
            //  title.SetText(page.CurrentPage.Title, TextView.BufferType.Normal);
            //  title.SetTypeface(tf, TypefaceStyle.Normal);
            //}
        }
    }
}

thank you,

Tommy McConnell