visibility and invisibility of hud by collision box ?

I have a static mesh that comes when I enter the area of the box collision.
Clicking this mesh view was a hud that enables exchange of texture another mesh / object.
What still could not get is: out of the box area of collision that can disappear mesh that allows me to see the hud as well as the hud.

Note: The mesh that makes it possible to see the hud, I can do it, the box collision make it appear and disappear.

I think the solution is to “link” the box collision visibility and invisibility and hud.
Now how does this do?

Does anyone have any idea how to do?