Button in ModalPopupExtender not calling server function

I have a page with a print button that first calls a ModalPopupExtender that asks the user what reports they want to print (3 radio buttons, "Print" button and "Cancel" button). The "Cancel" button dismisses the ModalPopup as expected. The "Print" button should then call a Sub routine to check which radio button is selected, generate the appropriate report for printing and dispaly it in a new ModalPopup.

My problem at this this stage is that when I click the "Print" button the page will display the second ModalPopup, but does not call the server routine to check the values from the first popup or populate the second one.
' Code in .aspx
--------------------------------
<asp:Panel ID="pnlReport" runat="server" CssClass="ReportButtons" Visible="false">
	<asp:ImageButton ID="btnPrint" runat="server" ImageUrl="~/Images/Icon/print.gif" />
</asp:Panel>
 
<asp:Panel ID="pnlPrint" runat="server" CssClass="modalPopup" style="display: none;">
	<h3>Select reports to print:</h3>
	<p><asp:RadioButton ID="rbAgent" runat="server" GroupName="Report" Checked="true" /> Agent - Property information<br />
	<asp:RadioButton ID="rbBuyer" runat="server" GroupName="Report" /> Buyer - Property Information (Excludes owner and sale information)<br />
	<asp:RadioButton ID="rbAgentBuyer" runat="server" GroupName="Report" /> Agent & Buyer - Property Information</p>
	<div class="center">
		<asp:Button ID="btnPrintPrint" runat="server" Text="Print" />
		<asp:Button ID="btnPrintCancel" runat="server" Text="Cancel" />
	</div>
</asp:Panel>
<cc1:ModalPopupExtender ID="mpePrint" runat="server" TargetControlID="btnPrint" PopupControlID="pnlPrint" CancelControlID="btnPrintCancel" OkControlID="btnPrintPrint" BackgroundCssClass="modalBackground" DropShadow="true"></cc1:ModalPopupExtender>
 
<asp:Panel ID="pnlPrintOutput" runat="server" CssClass="modalPopup" style="display: none;">
	<asp:Label ID="lblPrintOutput" runat="server"></asp:Label>
</asp:Panel>
<cc1:ModalPopupExtender ID="mpePrintOutput" runat="server" TargetControlID="btnPrintPrint" PopupControlID="pnlPrintOutput" BackgroundCssClass="modalBackground"></cc1:ModalPopupExtender>
 
 
' Code in .aspx.vb
--------------------------------
' This routine never gets called
Protected Sub btnPrintPrint_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnPrintPrint.Click
    If rbAgent.Checked Then
        GenerateAgentReport()
        lblPrintOutput.Text = sbAgentReport.ToString
        mpePrintOutput.Show()
    End If
...
End Sub
 
Protected Sub GenerateAgentReport()
...
End Sub

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DerekWatlingAsked:
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S31B1Commented:
Remove the property [OkControlID="btnPrintPrint"] from the first Modal Extender, if you use this property it deals with everything on the clientside, remove it and it will force a server side action.
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DerekWatlingAuthor Commented:
Still not having any luck. I have set break points in my code, but it never seems to get there.
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DerekWatlingAuthor Commented:
This is all inside an UpdatePanel inside a TabPanel inside an UpdatePanel and uses a MasterPage.

"pnlReport" has to stay where it is. When I try moving the 2 modal panels outside the inner UpdatePanel or to the begining/end of the page I get the following runtime errors respectively:
    "An extender can't be in a different UpdatePanel than the control it extends."
and
    "The TargetControlID of 'mpePrint' is not valid. A control with ID 'btnPrint' could not be found."
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DerekWatlingAuthor Commented:
Been experimenting all afternoon and found that if I only have 1 ModalPopupExtender everything works as expected. As soon as I add the 2nd one it doesn't! Is this a bug with AJAX? I'm using Visual Web Developer 2008 Express, ASP.NET 2.0 AJAX Extensions 1.0.61025, Ajax Control Toolkit 10920 and testing in IE7.

Ultimately what I want to achieve is to be able to generate a reports for printing and emailing. I plan on doing this as HTML and using CSS for page breaks, etc. I already have the data on the page and have stored it in a Public Shared DataRow variable so that I don't need to re-query the database. Our current system brings up the report in a new popup window. Due to the number of calls we already recieve from clients who have problems because of (multiple) popup-blockers I want to generate the report on the same page, either in a modal popup or a tab panel. This brings me to the problem of how to only print the contents of the selected panel. Would putting it in an <IFRAME> solve this issue? Any other suggestions?
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DerekWatlingAuthor Commented:
I am assigning the points for a partial solution and valuble information.

Regarding my printing issue I have posted a new question at http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_22986940.html
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