= load(
  local!data: {
    {id:1, name: "name 1", description: "description 1"},
    {id:2, name: "name 2", description: "description 2"},
    {id:3, name: "name 3", description: "description 3"},
    {id:4, name: "name 4", description: "description 4"}
  },
  local!gridSelection: a!gridSelection(
    pagingInfo: a!pagingInfo(
      startIndex: 1,
      batchSize: -1
    ),
    selected: null
  ),
  local!lastSelected,
  {	
  a!gridfield(
    columns: {
      a!gridTextColumn(
        label: "Name",
        field: "name",
        data: local!data.name
      ),
      a!gridTextColumn(
        label: "Description",
        field: "description",
        data: local!data.description
      )
    },
    totalCount: count(
      local!data
    ),
    value: local!gridSelection,
    saveInto: {
      a!save(
        local!gridselection,
        save!value
      ),
      a!save(
        local!gridselection.selected,
        if(
          isnull(
            local!gridselection.selected
          ),
          null,
          if(
            and(
              count(
                local!gridselection.selected
              ) < count(
                local!data
              ),
              count(
                local!gridselection.selected
              ) > 1
            ),
            remove(
              local!gridselection.selected,
              1
            ),
            if(
              count(
                local!gridselection.selected
              ) = count(
                local!data
              ),
              local!lastSelected,
              local!gridselection.selected
            )
          )
        )
      ),
      a!save(local!lastSelected, local!gridselection.selected)
    },
    identifiers: local!data.id,
    selection: true
  ),
  a!textField(
  	label: "Selected Row",
  	value: local!gridselection.selected
  )	
  }
)