Problem with targetControlID in Modal popup Extender

  

   In my application, I am using one GridView. In the last column of the GridView I put link button in Item Template and One Modal Popup Extender Control in the page.

I want to show one Panel as a Popup on the Click of Link Button to Display details of that row.

  

   Following is the Code.

  PopupControlID="pnlTest" TargetControlID="lbtnView"               CancelControlID="lbtnClose" >

 

TargetControlID="lbtnView"  here I am getting Error as this button is in the Item Template and can not be accessible directly in the Page.

So How do I popup the panel on click of the Link Button.

Any help appreciated......

Regards,

  Vikram