Assign Slate Widget Style to a Button in UE 4.13

Hi,

I’m trying to create a menu interface in which I have placed some buttons.

I’ve created a Slate Widget Style as shown in this tutorial ( Unreal engine 4 UMG - 1 - User Interface beginning. - YouTube ) but in the button details, under the style options, there isn’t the choice for the Slate Widget.
I have only the possibility to assign textures and other things to a single button state.(e.g. Normal, Hovered…).

The solution shown in the tutorial is deprecated or there is another way to do that?

Thank you for your reply, and sorry for my english.

Luca Mollo