call javascript from code behing without attribute.add and unable to find popup control ID

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ASP.NET

Hi every one,

As we know there occurs no post back for ajax tool kit controls.
i am using Modelpopupextender control,where popupcontrolid is set to a panel in which contains my gridview. I show this popup on textbox keyup event through javascript.Every thing is working fin. But, the problem is when i click on gridview(popup) for sorting on a column, the popup gets dissapear and i am unable to find modelpopupextender control to show again. How to show again the popup window from javascript and in which event. If ther is any other solution plz sujjest. If possible send me the code.


The given answer is OK but the peoblem is i am unable to get the ID of the ModelPopUpExtender, so that i acan show directly in poge load event or any other event. Unable to understand what is the reason behind of not getting its ID even.

thanks