I created a form in the adminhtml, all other fields are working well (ie., text, select, etc). However, I tried adding a button in the list of fields but it seems it's not picking up the value:
$fieldset->addField('test_button', 'button', array( 'name' => 'test_button', 'value' => 'Test Me', 'label' => 'Click the button to test', ));
Output is just:
<input id="test_button" name="test_button" value="" type="button">
Note that the value is empty, thus button is just a blank button.