EP UI guidelines when developing a listbox in ABAP Webdynpro

Hi,
Currently I am looking where I can find guidelines for developing UI elements in webdynpro (ABAB) in the HR context . More in particular I am looking for the Listbox options.
In this UI element normally you can choose a value of a predefined list.
But, most of the times there is also a 'Other' value you can choose. In that case the end user should fill in a value
of himself. It will be that value that will de store in the database.
- My question: how can this be done? (when an end user choose the 'Other' value, he/she can fill in a value that is not in the predefined list)?
- what are the guidelines for it?
E.g. a user must fill in his function.
He/she can choose out of: Commercial - Technical - Analytic - Other.
When u2018otheru2019 is chosen he/she can fill in Functional.
Thanks for an answer,
Erwin

Generally for this case you'll have a separate UI element which will be hidden. When the user chooses "Others" , this will be displayed and enabled for users to key-in. Idea here is to have a event triggered on selecting the entry from the list, and based on the value display the other UI element.
Regards
Ranganath

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