Zend_Form renders all fields as text - zend-framework

Question

I have a Zend_Form form, with some custom decorators, like this:
$decorators = array();
$decorators[] = new Zend_Form_Decorator_ViewHelper(array());
$decorators[] = new Zend_Form_Decorator_Errors;
$decorators[] = new Zend_Form_Decorator_HtmlTag(array('tag' => 'div', 'class' => 'form-item'));
$decorators[] = new Zend_Form_Decorator_Label(array('class' => 'form-label'));
$decorators[] = new Zend_Form_Decorator_Callback(array(
'callback' => function($content, $element, $options) {
return sprintf('<div class="form-row">%s</div>', $content);
},
'placement' => false
));
$this->setElementDecorators($decorators);
The problem is, that all of the fields are rendered as text inputs. Why does it happen?
EDIT: I discovered, that it doesn't render all the inputs necessarily as text inputs, but renders them with type of the first input in form. Here is example of a form that i use(the decorators are set int parent's init):
<?php
class Form_Users_Add extends Form_Base {
protected $pbxs = array(1 => 'Element 1', 2 => 'Element 2');
public function init() {
$monitors = new Zend_Form_Element_Checkbox('prefered_screen_count');
$monitors->setCheckedValue(2);
$monitors->setUncheckedValue(1);
$monitors->setLabel('two_monitors');
$this->addElement($monitors);
$pbx = new Zend_Form_Element_Select('asterisk_id');
$pbx->setMultiOptions($this->pbxs);
$pbx->setLabel('users_asterisk_id');
$this->addElement($pbx);
parent::init();
}
}

Answer 1

Yay! I have solved the issue! The cause was that I used INSTANCES of classes, not the names. This way every element was using the same instance of the decorator.