   switch parameter.type
     when 'enum', 'Key<Frame>', 'VecSpecifier'
       createDropdownControl parameter
-    when 'string[]'
+    when 'string[]', 'VecSpecifier[]'
       createListControl parameter
     when 'boolean'
       createCheckboxControl parameter

      interactionPairsParameter,
      monotoneConstraintsParameter,
      startColumnParameter,
      stopColumnParameter
    ] = map [
      'training_frame',
      'validation_frame',

      'interaction_pairs',
      'monotone_constraints',
      'start_column',
      'stop_column',
      'target_column',
      'encoded_columns'
    ], findFormField

    if trainingFrameParameter
      if responseColumnParameter or ignoredColumnsParameter or targetColumnParameter
        act trainingFrameParameter.value, (frameKey) ->
          if frameKey
            _.requestFrameSummaryWithoutData frameKey, (error, frame) ->
