When I use WebAnnotationViewer inside of asp:UpdatePanel, I'm getting the following error on each postback:
"Exception: 'document.frames[...]._co' is null or not an object."
Call stack (with some omissions):
atalaInitChild
atalaFireEvent
document.frames[_vp.id]._co.setZoom() <-- errors out here.

I'm wondering if you're looking into it?

Thanks, Sergey 

Environment: VS 2008, target: framework 3.5 

<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"/>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <cc1:WebAnnotationViewer ID="WebAnnotationViewer1" runat="server"/>
        <br />
        <asp:Button ID="Button1" runat="server" Text="PostBack"/>
    </ContentTemplate>
</asp:UpdatePanel>
</div>
</form>

 

Currently, the WebAnnotationViewer does not work inside of an UpdatePanel.  We are working on a fix, but we don't have a time frame as to when it will be completed.

For now, you can keep the WebAnnotationViewer outside of the UpdatePanel, and interact with it by using RemoteInvokable methods.  You should be able to achieve the same functionality by using both UpdatePanel and RemoteInvoke in conjunction with each other.

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David Cilley
My AJAX Imaging Blog
Atalasoft Development Team