The expand setting of ranpanelitem doesn't work after upgrade to the latest version

[Big Q]

hello telerik team,
    I have a RadPanelBar with some controls nested in it's ContentTempalte , and set the expland=true. it works well with the previous version, but after upgraded to the new version, it doesn't work. 
    And I find the same problem in your own sample: http://demos.telerik.com/aspnet-ajax/panelbar/examples/functionality/templates/defaultcs.aspx

<telerik:RadPanelBar runat="server" ID="RadPanelBar1" Width="742px" Height="330px"
        Skin="Forest" ExpandMode="FullExpandedItem" OnClientLoad="onLoad">
        <Items>
            <telerik:RadPanelItem Expanded="true">
            <HeaderTemplate>
            ......

Below is my code:
<telerik:RadPanelBar ID="rpbSelectUser" runat="server"
                ExpandMode="FullExpandedItem" Height="100%" Width="100%">
                <Items>
                    <telerik:RadPanelItem Expanded="True">
                        <ContentTemplate>
                        <div style="padding:8px 0px">
                        ........

[Yana]

Hello,

This is really a bug in RadPanelBar, we'll investigate the reasons for it and we'll try to fix it.

Thank you for reporting it, you can find your points updated.

Regards,
Yana
the Telerik team