asp.net - Modalpopupextender with usercontrol -

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i using different user controls modalpopupextender (within page, repeater etc.) , took time figure tricks how 2 togeather.

i have ended following problem

when pass param user control 

usercontrol.paramid = 1;

i able receive in user control, @ strange step of page cycle.

when try 

protected void page_prerender(object sender, eventargs e) {      throw new exception(paramid); }

i null paramid!?

but when 

<% throw new exception(paramid); %>

from html, correct paramid value.

i tryied store paramid viewstate, hiddefield, , doing same error.

also, when use user control wihout mpe, in regular aspx page, works fine.

what catch?


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