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multiple column with dropdownextender encounter jscript error

Posted By:      Posted Date: October 18, 2010    Points: 0   Category :ASP.Net

In order to have a multi-column dropdown list, I combined a textbox, a dropdownextender, and a panel with gridview inside it. Without update panel, 
everything works ok except postback causes flashes and I do not want that. So I have to user the update panel. And now, I got the error:
Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.
Anyone knows how to fix this problem?

Asp.net code:

<script type="text/javascript"> var checkForClose = "true"; function setOKToClose() { checkForClose = "false"; } function movePnlScroll(num) { if (num >= 10 && num < 25) { // var pnlConnectorPerformance = document.getElementById('ctl00_ContentPlaceHolder1_pnlConnectorPerformance'); var pnlConnectorPerformance = document.getElementById('pnlConnPerformance'); pnlConnectorPerformance.scrollTop = num * 22; } if (num >= 25) { // var pnlConnectorPerformance = document.getElementById('ctl00_ContentPlaceHolder1_pnlConnectorPerformance'); var pnlConnectorPerformance = document.getElementById('pnlConnPerf

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