Vaadin 13 Start & Material Theme

So I’m trying to play with the Vaadin13 Start (Java Only CRUD) and my question is this:
Although I change the @Theme(value = Lumo.class) to @Theme(value = Material.class) at the MainLayout.java, the buttons seem to be “Materialized” but all the TextFields are Valo theme like…
Is there something I should be doing differently in order to enable the Material theme at a Java only (no HTML) application?

Thanks!