Follow Drag and Drop messaging

I was wondering how would I go about implementing a trigger on "Follow Drag and Drop" behaviors mouse press/release on scene level. I am trying to do a jigsaw puzzle game and am using the fore mentioned behavior to do drag and drop.
I need to do some processing after the puzzle piece pickup and dropping, but am lost on best way to do this. I was trying a few different ways about this, for example i had a mouse press/release events on scene level that were scanning the actors for "Follow Drag and Drop" behavior then checking the "_Grabbed" attribute for status and then doing the processing for the ones with the "_Grabbed" flag set to true.
This however didnt quite work as there seemed to be some issues with updating as only the release event found "_Grabbed" to be true for one actor. Probably the press event fires on the scene level before the actor behavior sets the "_Grabbed" to true.

I solved this by using "Dragged" event instead of "Release" on scene level for now. Its not the way I would program this in a usual programming scenario, but it works for now.

You could modify the Follow Drag and Drop behavior and insert triggers at the points where the Dragged attribute gets set to true/false.

I intended to do just that but couldn't find a way to trigger events at scene level. I probably didn't look hard enough.

There are blocks "trigger event _ in all behaviors for this scene" and "trigger event _ in behavior _ for this scene". Maybe that's what you need.