=load(
  local!firstCheckBox;
  local!secondCheckBox;
  local!secondCheckBoxLabels: {"a", "b", "c", "d"};
  local!secondCheckBoxValues: {1, 2, 3, 4};
  with(
a!formLayout(
  label: "MultipleCheckbox Selection",
  instructions: "",
  firstColumnContents: {
    a!sectionLayout(
      label: "",
      firstColumnContents: {
        a!checkboxField(
          label: "Exchanges",
          labelPosition: "ABOVE",
          choiceLabels: {"CBOT", "CME", "COMEX", "NYMEX"},
          choiceValues: {1, 2, 3, 4},
          value: local!firstCheckBox,
          saveInto: local!firstCheckBox,
          validations: {}
        )
      },
      secondColumnContents: {
        a!checkboxField(
          label: "Class",
          labelPosition: "ABOVE",
          choiceLabels: if(isnull(local!firstCheckBox),
            local!secondCheckBoxLabels,
            fn!apply(index(local!secondCheckBoxLabels, _, null), fn!apply(wherecontains(_, local!secondCheckBoxValues), {local!firstCheckBox}))
          ),
          choiceValues: if(isnull(local!firstCheckBox),
            local!secondCheckBoxValues,
            fn!apply(index(local!secondCheckBoxValues, _, null), fn!apply(wherecontains(_, local!secondCheckBoxValues), {local!firstCheckBox}))
          ),
          value: local!secondCheckBox,
          saveInto: local!secondCheckBox,
          validations: {}
        )
      }
    )
  },
  secondColumnContents: {},
  buttons: a!buttonLayout(
    primaryButtons: {
      a!buttonWidgetSubmit(
        label: "Submit",
        style: "PRIMARY",
        saveInto: {}
      )
    },
    secondaryButtons: {
      a!buttonWidgetSubmit(
        label: "Cancel",
        style: "NORMAL",
        value: true,
        saveInto: {},
        skipValidation: true
      )
    }
  ),
  validations: {}
)))