anchor.diff:    handleErrorChange(dynamic errorStatus) {
       if (errorStatus is bool) {
         this.error = errorStatus;
  +      if (!errorStatus) {
  +        _customErrorMessage = null;
  +      }
  +    } else if (errorStatus is String) {
  +      error = true;
  +      _customErrorMessage = errorStatus;
  +    } else if (errorStatus == null) {
  +      error = false;
  +      _customErrorMessage = null;
       }
     }
   }
   
   abstract class FnxInputComponent implements OnInit {
   
  -  final FnxInput _wrapper;
  +  FnxInput _wrapper;
   
     final String _privComponentId = ui.uid("comp_");
   
     final EventEmitter errorStateChange = new EventEmitter();
   
  -  FnxInputComponent(this._wrapper);
  +  FnxInputComponent(@Optional() FnxInput wrapper) {
  +    this._wrapper = wrapper;
  +  }
   
     String get componentId {
       if (_wrapper != null) {
  
positive.code: 
    bool hasError() {
      return error;
    }
  
    FnxInputComponent get component => _component;
  
negative.code: 
  
    @Input() String label;
    String _errorMessage;
    String _customErrorMessage;
  
    bool error = false;
  
  