Linking two spinner components

MIT App Inventor Help
1

I have two spinner components of which i want to point one say “spinner A” items points to “spinner B” item by index

2

something like this?
How to create a nested listpicker
unfortunately the Spinner component does not offer a BeforeSelecting event

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.