[CommonUI] How do I set the back handler?

Development Programming & Scripting UI
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I’ve enabled the checkbox “IsBackHandler” on my CommonActivatableWidget. I’ve also tried ticking the “Auto Activate” checkbox, but that doesn’t change anything.

I can’t set the OnHandleBackAction function. It’s not in the list of overridable functions. I’ve done this before, but I can’t remember what I did. How do I set the back handler?

edit: I’m on 5.3

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I updated and rebuilt 5.3. It’s working now.

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