[Stackoverflow] [Progress OpenEdge ABL] How to get chosen value from combo-box as variable PROGRESS 4GL

[Rokas]

while doing a task I run into problem, I do not know how to obtain value from combo-box as variable, I have read a lot of documentation, but did not found a solution, maby you can advise me.

DEFINE VARIABLE StateBox AS CHARACTER FORMAT "X(256)":U 
         LABEL "Pick a Satete" 
         VIEW-AS COMBO-BOX INNER-LINES 5 
         DROP-DOWN-LIST
         SIZE 16 BY 1 NO-UNDO.
     
    DEFINE FRAME StateCombo
            StateBox
        WITH CENTERED ROW 4.
 
     FOR EACH State NO-LOCK BREAK BY State.StateName:
        StateBox:ADD-LAST(State.StateName) IN FRAME StateCombo. 
    END.
    
    vStateText = (SCREEN-VALUE:StateBox). //ERROR
    
    ENABLE StateBox WITH FRAME StateCombo.
    APPLY "VALUE-CHANGED" TO StateBox IN FRAME StateCombo.
    WAIT-FOR WINDOW-CLOSE OF CURRENT-WINDOW. //COMBO-BOX CREATED

I tried SCREEN-VALUE, STREAM, I want to get a solution

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