public NewAccount()
        {
            InitializeComponent();

            _callsignChecker = new CallsignChecker(_usernameTextBox, _errorProvider, _createAccountButton, new CallsignChecker.SetCheckMessageDelegate(SetCheckMessage));
        }
        public CreateCallsignControl()
        {
            InitializeComponent();

            _callsignChecker = new CallsignChecker(_newCallsignTextBox, _errorProvider, _createButton, new CallsignChecker.SetCheckMessageDelegate(SetCheckMessage), _legacyPasswordPanel);
        }