I don't get handle tick event handleTickEvent()

[I_ve_got_a_problem]

Hi

I'm trying to use handleTickEvent() in order to execute 2 functions in every tick, but it does nothing, I have declared virtual void handleTickEvent(); in the hpp file of my screen and then called it like this:

But this only calls those functions the first time i click on my scrollable container, and I'm not understanding what's happening, I mean I can get that I'm doing something wrong, but why does it get there only the first time I click on the scrollable container that the function updateList() updates?