You need to do it in Javascript (document.title = "Blah" + document.title).
Or if you disable Tapestry javascript validation the layout will be
rerendered as you expect.
Tapestry doesn't seem to have a good place to hook into failed javascript
validations though. As far as I can tell you'd hook into the submit event on
the form and check $T(theform).validationError. So:
$('id_of_the_form').observe('submit', function() {
if ($T($('id_of_the_form')).validationError)
document.title = "Blah" + document.title;
}
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