Remove SearchBar border

Hi,

How can I remove the gray border around the Searchbar in iOS?

I tried a custom renderer using below code but it is still not removed.

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

    if (e.OldElement == null)
    {
        UISearchBar bar = (UISearchBar)this.Control;
        bar.SetBackgroundImage(new UIImage(), UIBarPosition.TopAttached, UIBarMetrics.Default);
    }