Make changes to main form with ahah callback in Drupal? -

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i have form poll form.when there no data in db want show add button , when user clicks "more" want show him/her submit button. used following code seems doesn't works.

if ($form['count']['#value'] > 0) {   $form['submit'] = array(     '#type' => 'submit',     '#value' => t('submit')   ); }

how can this?

the values in $form_state['values'] try:

if($form_state['values']['count'] > 0){....

i expect @ point $form['count']['#value'] not set.


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