protected function _prepareLayout() { parent::_prepareLayout(); Varien_Data_Form::setElementRenderer($this->getLayout()->createBlock($this->rendererPrefix . '_element')); Varien_Data_Form::setFieldsetRenderer($this->getLayout()->createBlock($this->rendererPrefix . '_fieldset')); Varien_Data_Form::setFieldsetElementRenderer($this->getLayout()->createBlock($this->rendererPrefix . '_fieldset_element')); return $this; }