CustomValidator doesn't work with GridList

[ade045es]

Hello:

I am trying to do a custom validation in one field of the listGrid. I write the following simple code. But it doesn't work. The custom validator is never executed.

ListGridField itemIdField = new ListGridField("itemId", RECTIFICATIONS_MESSAGES.fieldItemId()); 
		itemIdField.setRequired(true);
		itemIdField.setCanEdit(true);
		itemIdField.setType(ListGridFieldType.INTEGER);
		IntegerRangeValidator itemIdRange = new IntegerRangeValidator();
		itemIdRange.setMin(0);
		itemIdRange.setMax(999999);
	
		
		CustomValidator c_validator = new CustomValidator() {
			
			@Override
			protected boolean condition(Object value) {
				GWT.log("Custom validation false");				
				return false;
			}
		};
		String[] dep_fields = {"itemId"};
		c_validator.setDependentFields(dep_fields);
		c_validator.setErrorMessage("Error de validacion customizado.");
		c_validator.setValidateOnChange(Boolean.TRUE);
		
		
		itemIdField.setValidators(itemIdRange,c_validator);
				
		itemIdField.setValidateOnChange(Boolean.TRUE);

Could you help me? What am I doing wrong?
Thanks in advance.