Look at the code that defines the editor

Finally, look at the code the AppBuilder generated to define the Comments field as an editor. Because this is a database field, and not a variable, the definition is in the DEFINE FRAME statement. To see this, you need to go into the Code Preview window (press F5):

DEFINE FRAME CustQuery
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     Customer.Comments AT ROW 5.86 COL 81 NO-LABEL WIDGET-ID 24
          VIEW-AS EDITOR SCROLLBAR-VERTICAL
          SIZE 39 BY 3.57
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