Tracker can’t work with trigger box to destroy thing

[pin-sin 0]

https://forum.vive.com/topic/8133-getting-started-with-the-htc-vive-tracker-pose-input-via-pogo-pins-in-unreal-engine-424/?tab=comments#comment-34711

I have followed the tutorial as above, it works as I can see and move the tracker in unreal VR preview.Then I try to make an event for the box to be destroyed while the tracker is in the trigger box, however, nothing happens. The following are my blueprints. Is there a way to solve the problem or any tutorial for tracker to design events in unreal?

 

Thank you!