Bug or misunderstanding

Hi to all,
I wish to use the pressed property to control the button's Statelist Drawable and activate the corresponding image.

I set the pressed property by designer but the corresponding statelist drawable image doesn't show.

It's a bug or I'm missing some informations about the use or behavior of the button statelists ?

The Pressed property only affects the visual designer and allows you to see how the button will look when pressed.