Drop down tutorial

I am trying to get my head around BonitaSoft and having some issue populating the drop down menu by using the below tutorial.
https://documentation.bonitasoft.com/bonita/7.9/web-service-tutorial

I have attached a doc with what I am trying to achieve and what I have done so far.
DropDown

Appreciate any help.

Hello,

What issue do you face exactly?

Regards,