Problem: When you render the form as a whole (i.e: <?php echo $this->form ?>), everything works fine, but when you render each element separate, the zendDijit {"id":"yourFormId","params":{"dojoType":"dijit.form.Form"}} is missing. This causes to break the validation/xhr process, because dijit.byId() returns only an ‘undefined’ value.
Solution: Go to your View, where you render your form and add the following:
$form = $this->form;
$this->dojo()->setDijit($form->getId(), array('dojoType' => 'dijit.form.Form'));
// add form tag ...
// add elements ...
It took me nearly 3 hours to figure this out 
Hope this helps someone.
Thank you, very much. It helped a lot.
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