Fixes: https://dl.dropbox.com/u/15227809/Xamarin/HZLVBinding.zip

gistfile1.cs

// To allow this project to build: https://dl.dropbox.com/u/15227809/Xamarin/HZLVBinding.zip 
// Add a new file to the HZLVBinding project with these contents:

using Android.Runtime;

namespace Com.Devsmart.Android.UI {

  partial class HorizontalListView {
    protected override Java.Lang.Object RawAdapter {
      get {return Adapter.JavaCast<Java.Lang.Object>();}
      set {Adapter = value.JavaCast<global::Android.Widget.IListAdapter>();}
    }
  }
}