/**
  * Retrieve all items
  *
  * @return array
  */
 public function getItems()
 {
     $items = parent::getItems();
     foreach ($items as $item) {
         $product = $item->getProduct();
         $item->setName($product->getName());
         $item->setPrice($product->getFinalPrice(1));
         $item->setTypeId($product->getTypeId());
     }
     return $items;
 }

 protected function _construct()
 {
     parent::_construct();
     $this->setId('sales_order_create_sidebar_pcompared');
     $this->setDataId('pcompared');
 }

 /**
  * Prepare layout
  *
  * Add button that clears customer's shopping cart
  *
  * @return Mage_Adminhtml_Block_Sales_Order_Create_Sidebar_Cart
  */
 protected function _prepareLayout()
 {
     $deleteAllConfirmString = Mage::helper('sales')->__('Are you sure you want to delete all items from shopping cart?');
     $button = $this->getLayout()->createBlock('adminhtml/widget_button')->setData(array('label' => Mage::helper('sales')->__('Clear Shopping Cart'), 'onclick' => 'order.clearShoppingCart(\'' . $deleteAllConfirmString . '\')', 'style' => 'float: right;'));
     $this->setChild('empty_customer_cart_button', $button);
     return parent::_prepareLayout();
 }

 public function __construct()
 {
     parent::__construct();
     $this->setId('sales_order_create_sidebar_pviewed');
     $this->setDataId('pviewed');
 }

 /**
  * Prepare layout
  *
  * Add button that clears customer's shopping cart
  *
  * @return Mage_Adminhtml_Block_Sales_Order_Create_Sidebar_Cart
  */
 protected function _prepareLayout()
 {
     $deleteAllConfirmString = Mage::helper('Mage_Sales_Helper_Data')->__('Are you sure you want to delete all items from shopping cart?');
     $this->addChild('empty_customer_cart_button', 'Mage_Adminhtml_Block_Widget_Button', array('label' => Mage::helper('Mage_Sales_Helper_Data')->__('Clear Shopping Cart'), 'onclick' => 'order.clearShoppingCart(\'' . $deleteAllConfirmString . '\')', 'style' => 'float: right;'));
     return parent::_prepareLayout();
 }