How to expose UNavigationSystem::OnNavigationBoundsUpdated?

Hi guys, I’m making a procedual map that uses navmesh, Ive set the “Force Rebuild on Load” to true, so it rebuild when I move the blueprint, but it doest rebuild when I compile it, so I seached here and found this post:

But the solution they found is to expose UNavigationSystem::OnNavigationBoundsUpdated

So I searched it and didnt find how to do it, does anyone here knows?

PS: I only found this link: https://docs.unrealengine.com/latest/INT/API/Runtime/Engine/AI/Navigation/UNavigationSystem/OnNavigationBoundsUpdated/index.html

PS2: sorry for my bad english, it’s not my native language

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