I would like to show a dialog after updating a field. So I have put this code as 'Trigger after update' of a choice field. The dialog doesn't show. When I add the code to a button, it works perfectly. Is is possible to use the dialog function in the 'Trigger after update'-event? How?

let result := dialog("Title", "Message", ["Option A", "Option B"]);
if result = "Option A" then
alert("Good choice")
else alert("Great")
end