How to make new UI button block raycasts

I’ve tried posting a question a few minutes ago but can’t see it, sorry it if made a duplicate.

I’m trying to make a button with the new UI canvas, and choosing “Block Raycasts” does not block them, and I activate both the button and the elements in the scene under it.

I have tried adding colliders to my button.

I am working on a touch interface (for mobile) in a 2D project.

Thanks.

Do you mean blocking the rays that you cast yourself? If so, then this is a similar question.

Also, on the 4.6 beta forum, the faq actually covers this aswell.