Remove cruft

samples/CocoaApp/ViewController.fs

@@ -8,14 +8,11 @@ type Container = Xamarin.UIProvider
 [<Register(Container.ViewControllerBase.CustomClass)>] 
 type myViewController(handle) =
     inherit Container.ViewControllerBase(handle)
-    
-    let onButton button =
-        printfn "Button pressed"
-            
+
     override x.ViewDidLoad () =
         base.ViewDidLoad ()
         // Do any additional setup after loading the view.
-        x.OnButton <- Some(fun _ -> x.View.Window.BackgroundColor <- AppKit.NSColor.Red)
+        x.OnButton <- Some(fun _ -> x.View.Window.BackgroundColor <- NSColor.Red)
 
     override x.RepresentedObject
         // Update the view, if already loaded.