public class MyTabbedPageRenderer : TabbedPageRenderer
 {
     private TabLayout tabLayout = null;

     protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
     {
         base.OnElementChanged(e);

         this.tabLayout = (TabLayout)this.GetChildAt(1);

         var selectPosition = this.tabLayout.SelectedTabPosition;

         tabLayout.TabMode = TabLayout.ModeScrollable;
         tabLayout.TabGravity = TabLayout.GravityFill;

         Handler h = new Handler();
         Action myAction = () =>
         {
             tabLayout.GetTabAt(selectPosition).Select();
         };

         h.PostDelayed(myAction, 1);
     }
 }