I am having magento grid sort option like bellow

1. Best Value
2. Price
3. Name

I want to modify it like bellow

1. My whislist
2. Price: High to Low
3. Price:Low to High
4. Designer:A-z
5. Designer:Z-A

Designer,Price are attributes so can add it list but how to make it ascending and开发者_运维技巧 descending sorting.

How can i sort product by "My Wishlist" ?

I tried this

$this->getOrderUrl('mywishlist', 'asc')

But not working.

     $tbl_wishlist_item = Mage::getSingleton('core/resource')->getTableName('wishlist_item');
     $tbl_wishlist = Mage::getSingleton('core/resource')->getTableName('wishlist');
     $tbl_catindex = Mage::getSingleton('core/resource')->getTableName('catalog_category_product_index');
     $tbl_price_index = Mage::getSingleton('core/resource')->getTableName('catalog_product_index_price');

 $collection = Mage::getResourceModel('catalog/product_collection');
  $collection->getSelect()
             ->join(array('t2' => $tbl_wishlist_item),'e.entity_id = t2.product_id','*')
             ->join(array('t3' => $tbl_wishlist),'t2.wishlist_id = t3.wishlist_id','*')
             ->join(array('t4' => $tbl_catindex),'e.entity_id = t4.product_id','*')
             ->where('t4.category_id = 3 AND t3.customer_id='.$customer_id);

I tried this collection it sorts the correct number of product.But does n't show any products objects like name,image,price and etc. What is the problem.