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Problem with WebProgressBar inside a WebDialogWindow


I have a WebProgressBar with a value of 0 inside a WebDialogWindow with WindowState="Hidden" by default. When I want to show the WebDialogWindow, with set_windowState, the WebProgressBar appears with a value of 100 and immediately falls to a value of 0.

Is it possible to avoid this, and directly show a value of 0?

Here is a code sample that illustrates the problem

<html xmlns="">
<head runat="server">
<script language="javascript" type="text/javascript">
function pageLoad(sender, args)
setTimeout("showWebDialog();", 500);
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script language="javascript" type="text/javascript">
function showWebDialog()
<form id="form1" runat="server">
<ig:WebScriptManager ID="WebScriptManager1" runat="server"></ig:WebScriptManager>
<ig:WebDialogWindow ID="WebDialogWindow1" runat="server" Height="300px" Width="400px" WindowState="Hidden">
<ig:WebProgressBar ID="WebProgressBar1" runat="server" Minimum="0" Maximum="100" Value="0"></ig:WebProgressBar>