Custom renderer for Picker

Hi,
I'm really new to Xamarin and Xamarin Forms as well, so maybe it's a stupid question:

I'm trying to implement my own renderer for Xamarin.Forms.Picker, I'm starting from Custom renderers example.

I want to render the picker as a spinner in android, and I'm able to do this with this code

    [assembly: ExportRenderer (typeof (MyEntry), typeof (MyEntryRenderer))]
    class MyEntryRenderer : PickerRenderer
        {
            Spinner   mySpinner;
            // Override the OnModelChanged method so we can tweak this renderer post-initial setup
            protected override void OnModelChanged (VisualElement oldModel, VisualElement newModel)
            {
                base.OnModelChanged (oldModel, newModel);

                // lets get a reference to the native control
                var nativeEditText = (TextView) Control;
                // do whatever you want to the EditText here!
                mySpinner = new Spinner (this.Context);
                nativeEditText.SetBackgroundColor(global::Android.Graphics.Color.Yellow);
                mySpinner.SetBackgroundResource (  CustomRenderer.Android.Resource.Drawable.spinner_border);
                this.SetNativeControl (mySpinner);
            }
    }

and it works pretty well.

This class is obviously written in the Android project, and in the shared Forms project I have the class MyEntry, which is used to add the View in the layout like this

Content = new StackLayout {
                Children = {
                    new Label {
                        Text = "Hello, Custom Renderer !",
                    }, 
                    new MyEntry {

                    }
                },
                VerticalOptions = LayoutOptions.CenterAndExpand,
                HorizontalOptions = LayoutOptions.CenterAndExpand,
            };

now what I'd like to do is to add some methods to MyEntry class where make calls to some methods in MyEntryRenderer, is that possible?

thank you very much