/**
  * Render contents
  * 
  * @return string
  */
 public function renderView()
 {
     $this->_prepareTree();
     return parent::renderView();
 }
 /**
  * Public constructor
  */
 function __construct()
 {
     parent::__construct();
 }
 /**
  * Render contents
  * 
  * @return string
  */
 public function renderView()
 {
     $this->_prepareContainer();
     return parent::renderView();
 }
 /**
  * Render contents
  * 
  * @return string 
  */
 public function renderView()
 {
     $this->_prepareGroupAction();
     $this->_prepareColumns();
     $this->_prepareCollection();
     $this->_prepareTable();
     return parent::renderView();
 }
 /**
  * Render contents
  * 
  * @return string
  */
 public function renderView()
 {
     $this->_prepareForm($this->getForm());
     return parent::renderView();
 }