How to Change SearchBar Cancel Button Icon in xamarin forms

I have used custom renderer to change the search bar underline color. But i don't know how to change the cancel button "cross (X) icon". My custom renderer is as below,

 public class CustomSearchBarRenderer : SearchBarRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<SearchBar> e)
        {
            base.OnElementChanged(e);

            if(Control != null)
            {
                var searchView = Control;
                searchView.Iconified = true;
                searchView.SetIconifiedByDefault(false);
                int searchIconId = Context.Resources.GetIdentifier("android:id/search_mag_icon", null, null);
                var icon = searchView.FindViewById(searchIconId);
                (icon as ImageView).SetImageResource(Resource.Drawable.icon);
            }

            if (e.OldElement == null)
            {
                LinearLayout linearLayout = this.Control.GetChildAt(0) as LinearLayout;
                linearLayout = linearLayout.GetChildAt(2) as LinearLayout;
                linearLayout = linearLayout.GetChildAt(1) as LinearLayout;

                GradientDrawable gd = new GradientDrawable();
                gd.SetStroke(0, Android.Graphics.Color.LightGray);

                linearLayout.Background = gd;

                AutoCompleteTextView textView = linearLayout.GetChildAt(0) as AutoCompleteTextView;
            }
        }
    }