Bean validator - validation method not being called

[Steve Wells]

A bit of validation grief here (Tapestry 4.0.2), I hope someone can help or
provide an example of their own of this (besides the one in Kent Tongs
book).

I'm trying to create a custom validator that grabs maxLength and required
info from the data model.  The "Bean" I define as the validator takes 3
parameters which are being set ok when the form is submitted but the *
validate* method is not called, and despite trying variations to acheive
this it still does not work.

Best elaborated in code:

Validator Bean:

public class DataObjectFieldValidator extends BaseValidator {
   // *** These fields are populated OK via their setters
   private String dataObjectName;
   private String fieldName;
   private DataContext dataContext;

   // This does not get called
   public void validate(IFormComponent iFormComponent, ValidationMessages
validationMessages, Object object) throws ValidatorException {
       if (log.isInfoEnabled()) {
           log.info("iFormComponent: " + iFormComponent);
           log.info("object: " + object);
       }
       throw new ValidatorException("Why is this not getting here???");

.page spec:

<bean name="myValidator" class="com.validator.DataObjectFieldValidator">
       <set name="dataContext" value="ognl:dataContext"/>
       <set name="dataObjectName" value="literal:MyDataObject"/>
       <set name="fieldName" value="literal:myField"/>
   </bean>
   <component id="question" type="TextField">
       <binding name="value" value="question"/>
       <binding name="validators" value="bean:myValidator"/>
   </component>

Java page class:

// This will work for built in validators but not the custom bean
if (getDelegate().getHasErrors()) {
   log.info("Entry Errors found: " + getDelegate().getFirstError());
   return null;
}

TIA,

Steve