Agentry: Trigger action when changing main screen tab

Hi,

I'm adapting Work Manager for iPad and in my main screen I have 4 tab screens: Work Orders, Notifications, Time Sheets and Crew Manager.

I would like to trigger a List Selection action step when the user navigates to the Time Sheets tab in order to select the current day of the week automatically. I already created and tested the action with a button and it's working fine but I don't find a way to trigger an action when changing main screen tabs.

Here my main screen:

In the screen definition there is not much I can define... just the icon, size and styling...