Binding in Custom Renderer gives wrong value in Xamarin.Forms 1.3.4.6332

Hi folks,

I have a custom control inside ListView like this

public class VideoCustomView : View
{
        public VideoCustomView ()
        {
        }

        public static readonly BindableProperty FileSourceProperty = 
            BindableProperty.Create<VideoCustomView,string>(
                p => p.FileSource,string.Empty);

        public string FileSource {
            get { return (string)GetValue (FileSourceProperty); }
            set { SetValue (FileSourceProperty, value); }
        }
    }

and a custom renderer on iOS (*simplified just to check the value of FileSource )

public class VideoViewRenderer : ViewRenderer<VideoCustomView, View>
{
    protected override void OnElementChanged (ElementChangedEventArgs<VideoCustomView> e)
    {

        base.OnElementChanged (e);

        if (e.OldElement != null)
            return;

        string file = e.NewElement.FileSource;
        TextView lable = new TextView (Context);
        lable.Text = file.Substring (file.Length - 10);

        base.SetNativeControl (lable);

    }

}

I got random value that is totally different from itemsource, it was working fine in 1.3.1.6296

Anyone having this similar error?
Thanks,