How do I check in verse if a capture area device changed its control?

Development Programming & Scripting Verse
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2

I created a trigger device and put to trigger when the capture area change it’s control

Then in code, added:

OnBegin():void=
triggerD.TriggeredEvent.Subscribe(OnControlChange)

OnControlChange(newAgent: ?agent): void =
NewUI := MakeUI_A()
NewUI.SetVisibility(InVisibility := widget_visibility.Hidden)

(i want to hide a widget when the control change)

There’s no error in the code, but it’s not working. I did put a print in the OnControlChange to debug, but it don’t even print a message