Fitnesse : How to select the Checkbox inside grid ?

Here is a simple recipe I wrote that you can copy and paste into the interface designer.

load(
  local!data: {
    {name: "Chairs", flag: false},
    {name: "Laptops", flag: true},
    {name: "Desks", flag: false}
  },
  a!gridLayout(
    instructions: local!data,
    headerCells: {
      a!gridLayoutHeaderCell(label: "Name"),
      a!gridLayoutHeaderCell(label: "Flag")
    },
    columnConfigs: {
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE"
      ),
      a!gridLayoutColumnConfig(
        width: "ICON"
      )
    },
    rows: a!forEach(local!data,
      a!gridRowLayout(
        contents: {
          a!textField(
            value: fv!item.name,
            readOnly: true
          ),
          a!checkBoxField(
            choiceLabels: {""},
            choiceValues: {true},
            value: if(fv!item.flag, {true}, null),
            saveInto: a!save(fv!item.flag, if(save!value, true, false)),
            align: "CENTER"
          )
        }
      )
    )
  )
)
    

Here is a simple recipe I wrote that you can copy and paste into the interface designer.

load(
  local!data: {
    {name: "Chairs", flag: false},
    {name: "Laptops", flag: true},
    {name: "Desks", flag: false}
  },
  a!gridLayout(
    instructions: local!data,
    headerCells: {
      a!gridLayoutHeaderCell(label: "Name"),
      a!gridLayoutHeaderCell(label: "Flag")
    },
    columnConfigs: {
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE"
      ),
      a!gridLayoutColumnConfig(
        width: "ICON"
      )
    },
    rows: a!forEach(local!data,
      a!gridRowLayout(
        contents: {
          a!textField(
            value: fv!item.name,
            readOnly: true
          ),
          a!checkBoxField(
            choiceLabels: {""},
            choiceValues: {true},
            value: if(fv!item.flag, {true}, null),
            saveInto: a!save(fv!item.flag, if(save!value, true, false)),
            align: "CENTER"
          )
        }
      )
    )
  )
)