Goal: I want to set as default , a value that is on my combobox list

Current state: It shows nothing but the label.

I've been reading the docu, but can't get the way to solve my problem.

I've seen this solution on an older post, that says using
value: states.first()
will show the first element. It is not exactly what i want but it can do the job.
Here state is a reference for the

The problem i have, is that in my code my store value looks like this:

store: {type:"horarios", autoLoad:true}
Wish someone can show me the right way to understand this, Thank you