Suppressing postbacks in an ASP.NET AJAX Accordion Control
foreach (var pane in accordion.Panes)
{
    HiddenField hfdIsResolved = (HiddenField)pane.HeaderContainer.FindControl("hfdIsResolved");
    if (Convert.ToBoolean(hfdIsResolved.Value))
    {
        pane.HeaderCssClass = "accordionHeaderResolved";
    }
    else
    {
        pane.HeaderCssClass = "accordionHeaderUnresolved";
    }
}