Dynamic grid .

load(
  local!rowsCount,
  local!items: {},
  a!sectionLayout(
    contents: {
      a!columnsLayout(
        columns: {
          a!columnLayout(
            contents: {
              a!integerField(
                label: "Enter No Of Rows",
                value: local!rowsCount,
                saveInto: {
                  local!rowsCount,
                  a!save(
                    local!items,
                    if(
                      isnull(
                        local!rowsCount
                      ),
                      {},
                      a!forEach(
                        items: repeat(
                          local!rowsCount,
                          1
                        ),
                        expression: {
                          firstName: "",
                          lastName: ""
                        }
                      )
                    )
                  )
                }
              )
            }
          ),
          a!columnLayout(
            contents: {}
          )
        }
      ),
      a!gridLayout(
        label: "Dynamic Grid",
        headerCells: {
          a!gridLayoutHeaderCell(
            label: "First Name"
          ),
          a!gridLayoutHeaderCell(
            label: "Last Name"
          ),
          
        },
        rows: {
          a!forEach(
            items: local!items,
            expression: a!gridRowLayout(
              contents: {
                a!textField(
                  value: local!items[fv!index].firstName,
                  saveInto: local!items[fv!index].firstName
                ),
                a!textField(
                  value: local!items[fv!index].lastName,
                  saveInto: local!items[fv!index].lastName
                )
              }
            )
          )
        },
        rowHeader: 1,
        showWhen: if(
          isnull(
            local!rowsCount
          ),
          false(),
          true()
        )
      )
    }
  )
)

hey , thanks , this is exactly what i needed. 

hey , thanks , this is exactly what i needed.