Custom widgets - Modules error ?

Hi guys,

I just tried the documented sample for creating custom widgets (the caroussel one), using BonitaSubscription7.5.4 and Community7.6
It works when I use the widget in a simple page.

On the other hand, when I put the widget in a tabsContainer, it doesn't work anymore.
On the TabsContainer page (http://localhost:8080/designer/#/fr/widget/pbTabsContainer) I can see that it also uses "ui-bootstrap-tpls-0.13.0.min.js" and "ui.bootstrap.tabs, ui.bootstrap.tpls"

So just to be sure, is it because of a conflict with required modules ? How can it be avoided / corrected ?
Pierre