How can I show the data with comma(,) in drop down box on window?

I have written the program to show all the data on window but stuck in the case for showi a single record with comma(,) in drop down box. Let me share codes what i tried.

DEFINE TEMP-TABLE tt_seq_report
FIELD npai_output_expression AS CHARACTER FORMAT "X(50)".

/* Followings are written inside the drop down box using progress app builder */
/* ON VALUE CHANGED OF coCombo-4 Part Type(Label Name) */
DO:

DEFINE VARIABLE cPartTyp AS CHARACTER NO-UNDO.
CREATE tt_seq_report.
ASSIGN
tt_seq_report.npai_attribute_expression = "22+++,56-".

coCombo-4:ADD-LAST(tt_seq_report.npai_attribute_expression).

END.


When I run the window and select the drop down box then i can see the value upto before comma(,) i.e 22+++ but it should show the full value like 22+++,56-. May I get any help regarding this?

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