=load(
local!exchanges,
local!classes,
a!sectionLayout(
  label: "Lorem Ipsum",
  firstColumnContents: {
    a!checkboxField(
      label: "Exchange",
      labelPosition: "ABOVE",
      choiceLabels: {"CBOT", "CME","COMEX","NYMEX"},
      choiceValues: {"CBOT", "CME","COMEX","NYMEX"},
	  value:local!exchanges,
      saveInto: {
		  local!exchanges,
		  a!save(
			local!classes,
			if(
				isnull(local!exchanges),
				null,
				fn!choose(
					length(local!exchanges),
					if(
						local!exchanges="CBOT",
						append(split({"a","b","c"},";")), 
						if(
							local!exchanges="CME",
							append(split({"d","e"},";")), 
							null
						)
					),
					if(
						length(wherecontains(local!exchanges,{"CBOT", "CME"})) = 2,
						append(split({"a", "b","c","d","e"},";")),
						null
					),
					if(
						length(wherecontains(local!exchanges,{"CBOT", "CME","COMEX"})) = 3,
						append(split({"a", "b","c","d","e","f"},";")),
						null
					),
					if(
						length(wherecontains(local!exchanges,{"CBOT", "CME","COMEX","NYMEX"})) = 4,
						append(split({"a", "b","c","d","e","f","g"},";")),
						null
					)	
				)
			)
		  )
	  },
      validations: {}
	  )
  },
  secondColumnContents: {
    /* Add components here for a two-column section */
    a!checkboxField(
      label: "Class",
      labelPosition: "ABOVE",
      choiceLabels: {"a", "b","c","d","e","f","g"},
      choiceValues: {"a", "b","c","d","e","f","g"},
	  
	  value:local!classes,
      saveInto: {local!classes},
      validations: {}
    )
  },
  validations: {}
)
)