Combo Box - Using the GROUP BY Clause

[AyieKepong]

From the URL below, I have trying to populate data from field in combobox. I'm query from rest service but i'm having trouble to populate data using GROUP BY Clause.

http://forums.arcgis.com/threads/14842-Populate-Combobox-from-FeatureSet?highlight=combobox


Anyone know how to make query with GROUP BY clause in flex. Any help is appreciated.