Android - Embedded Resource and CustomRenderer

Hi,
currently i am Xamarin.Forms with Android and it's pretty cool. But i now faced a problem and i cant find a solution so far.

Inside my PCL i've created this class

public class DDSButton : View
{
    public DDSButton ()
    {

    }

    public static readonly BindableProperty BackgroundImageProperty =
        BindableProperty.Create<DDSButton,ImageSource> (p => p.BackgroundImage, null);

    public ImageSource BackgroundImage {
        get { return (ImageSource)GetValue (BackgroundImageProperty); }
        set { SetValue (BackgroundImageProperty, value); }
    }
}

Inside my droid i've the DDSButtonRenderer

[assembly: ExportRenderer(typeof(DDSButton), typeof(DDSButtonRenderer))]
namespace HelloX.Droid
{
    public class DDSButtonRenderer : ViewRenderer<DDSButton, Android.Widget.ImageButton>
    {
        protected override void OnElementChanged (ElementChangedEventArgs<DDSButton> e)
        {
            base.OnElementChanged (e);

            if (e.OldElement != null || this.Element == null)
                return;

            var btn = new Android.Widget.ImageButton (Forms.Context);
            btn.SetBackgroundColor (Android.Graphics.Color.Transparent);
            btn.SetImageResource (HelloX.Droid.Resource.Drawable.BTN_Abbrechen);

            SetNativeControl (btn);
        }
    }
}

How can i set the ImageResource of the ImageButton to the ImageResource of the Embedded Resource ?