@IBAction func onEnterInTextField(_ sender: NSTextFieldCell) {
    let selectedRowNumber = messagesTable.selectedRow
    if selectedRowNumber != -1 {
        items[selectedRowNumber] = sender.stringValue
    }
}

func tableViewSelectionDidChange(_ notification: Notification) {
    let selectedRowNumber = messagesTable.selectedRow
    //
}

func tableView(_ tableView: NSTableView, shouldSelectRow row: Int) -> Bool {
     return true
}