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kotlinlang

Got a question about a textfield validator:
I have a simple view with an FXML and am trying to add a validator to the textfield:


```
private val fooModel: FooModel by inject()
private val foo: TextField by fxid()
init {
  foo.textProperty().bindBidirectional(fooModel.barProperty)
  foo.validator {
    success("OK")
  }
}
```

Running the app with the validator statement throws an IllegalArgumentException "The addValidator extension can only be used on inputs that are already bound bidirectionally to a property in a Viewmodel. Use validator.addValidator() instead or make the property's bean field point to a ViewModel."
I thought the previous statement did the bidirectional bind.  Any tips?