Nested clickable Container

Situation:
I want to implement nested CSSLayouts, where the whole CSSLayout is clickable, based on the
ComponentTree Add-On
.

Example:

  1. CSSLayout A
    1.1. CSS Layout A1

Problem:
My problem is, that if “A1” is clicked, there are two events fired: one from A1 and another from A (in this order), as A1 is nested into A.
Is it possible to surpress this behavior and only fire the event from A1?