Problem:

Having a detail's subApp's form separated into multiple (more than two) tabs using a tabbed-layout.
In dialogs it works perfect. In detail subApp the middle tabs are not reachable.

Cause

The tabs 2 & 3 get the same tab index "-1".

Steps to reproduce

1. Use the light module I attach.
2. Create an event/item
3. Try to reach tab two, the middle tab.

training-events-contentapp.zip

Expected results

One can reach the middle tab.

Actual results

One ends up always on the last tab, the last with tab index "-1"
The orange tab can not be reached:

Workaround

None

Development notes