Hierarchical submenus in option menu buttons

[jbv at souslelogo.com]

Hi list,

I am trying to create a hierarchical submenu in an option menu button
with LC 9.6.
I have found this solution that seems to work only with pulldown buttons 
:
https://use-livecode.runrev.narkive.com/cBfAjix2/cascading-menu

I also found this LC lesson that suggests to use polylists :
https://livecode.com/using-polylist-to-create-dropdown-menus/
But that seems way too sophisticated for a simple submenu.

Any idea ?
Thank you in advance.

jbv