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DropDownList SelectedIndexChanged not firing for extra <form>

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I'm using .NET framework 1.1 and VS.NET 2003 for a aspx web form.

There is a DropDwonList on the page and its SelectedIndexChanged event is
fired to the server normally, until when I add another form "FormDummy" onto
the main form, and then the event no longer fires again when the user change
the value of the drop down list.

Can anybody help ? Thanks so much!

The aspx code is as follows:
(Every thing works fine is the form "FormDummy" is abscent !)

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb"
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema"
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">

<form id="FormDummy" method="post">

<form id="Form2" method="post">
<aspropDownList id="DropDownList1" style="Z-INDEX: 101; LEFT: 168px;
POSITION: absolute; TOP: 64px"
runat="server" Width="160px" AutoPostBack="True">
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>

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