Android Question "Image file" empty in button property

Hello everybody,

First of all let me say that I'm not very experienced with B4A, so I got somme trouble to use it!

I try to setup an image for a button:

1-I added the right png images in the "Files" folder,

2-I designed the button: StatelistDrawable, BitmapDrawable for enabled state,

3-When I click the "image file" this field is empty

I certainly made a mistake ... but where?

Any help will be greatfully appreciated ...

Regards