Custom renderer; replacing the native control properly

Let's say I want to use my custom Android button FlatButton from the FlatUI component on the store.

I can simply write a custom renderer like this:

    public class MyButtonRenderer : ButtonRenderer
    {

        private FlatButton _button;

        public MyButtonRenderer()
        {
            _button = new FlatButton (Forms.Context);
            _button.Theme = FlatTheme.Sky ();
        }

        protected override void OnElementChanged (ElementChangedEventArgs<Button> e)
        {
            base.OnElementChanged (e);
            SetNativeControl (_button);
        }
    }

However, there are problems:
- It loses all even handlers like the click handler.
- It behaves randomly sometimes, so within a ListView the text displayed will be in a wrong size, but scrolling up and down again makes it renders correctly.

I must be doing something wrong here or missing something, what is it?
Basically, what's the right way of setting my own native control using SetNativeControl without messing things up?