Interactions with buttons into ScrollRect (4.6 beta 20)

Hi !
I’ve some problems with my buttons into a ScrollRect, I’can’t interact with them (and “highlight” don’t work too). If I place them out of the scroll rect it’s work.
Can you help me ?
Screen : Screenshot by Lightshot
Thanks !

ok it’s working,
Use a panel, not a canvas to put the list of button and place the anchor fit with the scroll Rect.