Accessing property inside over & down button

Hello.
I’ve a button named “loupe”.
In the “Default” script of the first frame of my project, i put :
loupe.rayons.opacity = 0;
where “rayons” is a clip inside my button “loupe”.
When i launch my project, the opacity of the clip “rayons” is well set to 0
BUT : it is only the opacity of the clip “rayons” in the frame “up” of the button “loupe” ! When hovering on the “loupe”, or clicking on it, the “rayons” appears (opacity <> 0) !

My question is : how can i access the property of clips inside the “over” or “down” frame ?

Thanks :)