I was choice expandmode="SingleExpandedItem" but i also can see more Items can be expand

[binbin]

That is my oode. first  we can see just one item is expand. now you can click "start"
then click "contentmanager"   we can see two items are expand.
How can i  fix? I was try to add click event, but i can't collapse the last expandItem

 <telerik:radpanelbar id="RadPanelBar1"  runat="server"
                    width="180px" skin="Web20" enableembeddedskins="False"
                    expandmode="SingleExpandedItem">
                    <CollapseAnimation Type="None" Duration="100"></CollapseAnimation>
                    <Items>
                        <telerik:RadPanelItem Text="Start" Target="Main" NavigateUrl="Home.aspx">
                        </telerik:RadPanelItem>
                        <telerik:RadPanelItem runat="server" Text="Productmanager" Enabled="true" Expanded="true">
                            <Items>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="1" Text="Producten beheren"
                                    NavigateUrl="aaa1.aspx">
                                </telerik:RadPanelItem>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="1" Text="Producten aanmaken"
                                    NavigateUrl="aaa2.aspx">
                                </telerik:RadPanelItem>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="6" Text="Producten importeren"
                                    NavigateUrl="aaa3.aspx">
                                </telerik:RadPanelItem>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="3" Text="Product attributen"
                                    NavigateUrl="aaa5.aspx">
                                </telerik:RadPanelItem>
                            </Items>
                        </telerik:RadPanelItem>
                        <telerik:RadPanelItem runat="server" Text="Ordermanager">
                            <Items>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="35" Text="Orders vandaag"
                                    NavigateUrl="~/xxx1.aspx">
                                </telerik:RadPanelItem>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="43" Text="Order rapportage"
                                    NavigateUrl="~/xxx2.aspx">
                                </telerik:RadPanelItem>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="41" Text="Klantgegevens exporteren"
                                    NavigateUrl="~/xxx3.aspx>
                                </telerik:RadPanelItem>
                            </Items>
                        </telerik:RadPanelItem>
                        <telerik:RadPanelItem runat="server" Text="Contentmanager">
                            <Items>
                                <telerik:RadPanelItem Target="Main" runat="server" Value="0" Text="Categorie&euml;n beheren"
                                    NavigateUrl="xxx4.aspx">
                                </telerik:RadPanelItem>

                            </Items>
                        </telerik:RadPanelItem>
                        <telerik:RadPanelItem runat="server" Target="Main" Value="33" Text="Reviewmanager"
                            NavigateUrl="xxx5.aspx">
                        </telerik:RadPanelItem>
                        <telerik:RadPanelItem Value="21" runat="server" Text="Statistiekmanager">
                            <Items>
                                <telerik:RadPanelItem Target="Main" runat="server" Text="Samenvatting" NavigateUrl="~/xxxx6.aspx">
                                </telerik:RadPanelItem>

                            </Items>
                        </telerik:RadPanelItem>
                    </Items>
                    <ExpandAnimation Type="None" Duration="100"></ExpandAnimation>
                </telerik:radpanelbar>

[Paul]

Hello binbin,

Please find below your modified code snippet that works as expected.

<form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" runat="server">
            </asp:ScriptManager>
        </div>

        <script type="text/javascript">
        function OnClientItemClicked(sender, eventArgs)
        {
            sender.get_expandedItem().set_expanded(true);
        }
        </script>

        <telerik:RadPanelBar
            ID="RadPanelBar1"
            runat="server"
            Width="180px"
            Skin="Web20"
            ExpandMode="SingleExpandedItem"
            PersistStateInCookie="false"
            OnClientItemClicked="OnClientItemClicked">

Greetings,
Paul
the Telerik team

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[binbin]

Fixed, thanks Paul