I recently needed to do this.
Try adding a bit of this code:
DEFINE VARIABLE hBrowse AS WIDGET-HANDLE NO-UNDO.
DEFINE VARIABLE hbrCol AS WIDGET-HANDLE NO-UNDO.
DEFINE VARIABLE iIndex AS INTEGER NO-UNDO.
DO iIndex = 1 TO hBrowse:NUM-COLUMNS :
ASSIGN hbrCol =...
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