Entry control does not creates an instance of a TextBox on Windows Phone (Custom Renderer)

Entry Renderer for entry control on Xamarin.Forms does not create an instance of a TextBox on Windows Phone native control as it should. In Xamarin Forms (Customizing an Entry) documentation it references that entry control creates an instance of TextBox in Windows Phone.

But in fact xamarin entry control creates an instance of a Grid control on Windows Phone native control (Custom Renderer) as you can see in the image bellow.

Is this a bug? Is there any other renderer that uses a TextBox on Windows Phone?

I'm using Xamarin.Forms version 2.0.0.6490.