Client Validation don't display Global Messages

When I define a Validation like this:

@Validations(requiredStrings = {
@RequiredStringValidator(fieldName = "loginuser", type = ValidatorType.FIELD, message = "Login User is required"),
@RequiredStringValidator(fieldName = "loginpassword", type = ValidatorType.FIELD, message = "Password is required")
}, expressions = {
@ExpressionValidator(expression = "loginpassword.trim().equals('test') == true", message = "Password must be test."),
})

The Form with XHTML Theme only display the RequiredString Messages but not the Expression Message.