AJAX :: Autocomplete Extender With Gridview?

In my recent project i have used auotcomplete extender. it work well with simple textbox

Now i want to use it with gridview , in my application for fill product details for any order i have used gridview if user wants to add multiple products so by making class create list of objects of that class and bind to gridview i am able to add row. in that row one field stock code now on that i want to use autocomplete extender as per below code

[Code]....