Xamairn Forms UWP RaiseLower Child Issue

using System;
using System.Collections.Generic;
using System.Diagnostics;
using Xamarin.Forms;

namespace Xam.Plugin.ETL
{
    public class ExpandableTabLayout : Layout<View>
    {

        public static readonly BindableProperty TabCountProperty = BindableProperty.Create(nameof(TabCount), typeof(int), typeof(ExpandableTabLayout), 0, propertyChanged: OnTabCountChanged);
        public static readonly BindableProperty FocusedViewProperty = BindableProperty.Create(nameof(FocusedView), typeof(View), typeof(ExpandableTabLayout), null, propertyChanged: OnFocusedViewChanged);

        private static void OnFocusedViewChanged(BindableObject bindable, object oldValue, object newValue)
        {

        }

        private static void OnTabCountChanged(BindableObject bindable, object oldValue, object newValue)
        {
            // Handle animations and applying the new tab
            var self = (ExpandableTabLayout) bindable;
            self.InvalidateMeasure();
        }

        public View FocusedView
        {
            get { return (View)GetValue(FocusedViewProperty); }
            set { SetValue(FocusedViewProperty, value); }
        }

        public int TabCount
        {
            get { return (int) GetValue(TabCountProperty); }
            set { SetValue(TabCountProperty, value); }
        }

        private bool TabsDisplayed = false;

        protected override void OnChildAdded(Element child)
        {
            if (FocusedView == null)
                FocusedView = child as View;
            base.OnChildAdded(child);
        }

        protected override void LayoutChildren(double x, double y, double width, double height)
        {
            SortStack();
            if (!TabsDisplayed)
            {
                foreach (var child in Children)
                {
                    if (child != FocusedView)
                        child.InputTransparent = true;
                    LayoutChildIntoBoundingRegion(child, new Rectangle(x, y, width, height));
                }
            }
        }

        /// <summary>
        /// Sorts the stack based on the FocusedView
        /// </summary>
        private void SortStack()
        {
            for (int i = 0; i != Children.Count; i++)
            {
                if (Children[i] != FocusedView)
                    LowerChild(Children[i]);
            }

            RaiseChild(FocusedView);
        }

        public void ToggleTabView()
        {
            TabsDisplayed = !TabsDisplayed;

            if (TabsDisplayed)
                DisplayTabs();
            else
                HideTabs();
        }

        private async void HideTabs()
        {
            // Hide unselected first
            foreach (var child in Children)
            {
                if (child != FocusedView)
                {

                }
            }

            // Display Selected
            await FocusedView.ScaleTo(1, 500, Easing.SpringIn);

            // Place unselected into normal scale for later
            foreach (var child in Children)
            {
                if (child != FocusedView)
                {
                    child.Scale = 1;
                }
            }

            // Invalidate and redraw
            InvalidateLayout();
        }

        private void DisplayTabs()
        {
            foreach (var child in Children)
            {
                child.ScaleTo(0.75, 500, Easing.SpringOut);
            }
        }
    }
}