Modal Popup With different modal Popupcontrol id

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ASP.NET

Hi All,

I have stuck in a problem and i am working on this last 10 days but i din't get any optimal solution . please help me out.

Problem:

I have an aspx page with one dropdownlist, one hyperlink, one modal popup extender and 4 user control registered on aspx page.
On the basis of selected value of dropdownlist i have to show one user control from 4 user controls at a time as modal popup. On modal popup on click of OK button i want to return a List<generic> data source to my parent page.

But i am not able to change the popup control id of modal popup at run time i.e. by server side code.

Please suggest me how can i achive thisOR any other way to do the same thing, it would be very helpful for me.
Its very urgent for me.

TIA.

Avinash