title: Adding non empty validation in zend form
body: <p>I have a misunderstanding about zend non empty validation. I am using following code for zend form to generate a <code>textarea</code></p>
  
  <pre><code> $this-&gt;addElement('textarea', 'comment', array(
         // 'label'      =&gt; 'Please Comment:',
          'required'   =&gt; false,
          'validators' =&gt; array('NotEmpty')
      ));
  </code></pre>
  
  <p>If I change <code>required</code> attribute to false then It works and values are not gone to database. But Problem is that if I set <code>requried=&gt;true</code>, It shows the validation message even before submit of form soemthing like this <code>Value is required and can't be empty</code>.
  Now What I want that this message shouldn't be shown before the form is submitted but validation of non empty should be implemented. Please guide where Am I wrong?</p>