telerik org chart collapse functionality not working

[Ali]

I'm using Telerik ASP.NET OrgChart to display a simple chart organization, I've a rather small problem: my chart doesn't show any thing for expanding/collapsing the chart, so my chart (which can be large) is displayed with all nodes and it is not I want, I want to be able to hide/show my nodes so that user can navigate chart easily, I've exactly used the code in this sample:
http://www.telerik.com/help/aspnet-ajax/orgchart-expand-collapse.html
but my chart doesn't show hide/show icons, what is going wrong? Do you I miss anything? it is my code:

<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>

        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<telerik:RadOrgChart ID="RadOrgChart1" runat="server" EnableCollapsing="true">
    <Nodes>
        <telerik:OrgChartNode>
            <GroupItems>
                <telerik:OrgChartGroupItem Text="Item1">
                </telerik:OrgChartGroupItem>
                <telerik:OrgChartGroupItem Text="Item1">
                </telerik:OrgChartGroupItem>
            </GroupItems>
            <Nodes>
                <telerik:OrgChartNode>
                    <GroupItems>
                        <telerik:OrgChartGroupItem Text="Item1">
                        </telerik:OrgChartGroupItem>
                        <telerik:OrgChartGroupItem Text="Item1">
                        </telerik:OrgChartGroupItem>
                    </GroupItems>
                </telerik:OrgChartNode>
                <telerik:OrgChartNode Collapsed="true">
                    <GroupItems>
                        <telerik:OrgChartGroupItem Text="item1">
                        </telerik:OrgChartGroupItem>
                    </GroupItems>
                    <Nodes>
                        <telerik:OrgChartNode>
                            <GroupItems>
                                <telerik:OrgChartGroupItem Text="Item1">
                                </telerik:OrgChartGroupItem>
                                <telerik:OrgChartGroupItem Text="Item1">
                                </telerik:OrgChartGroupItem>
                            </GroupItems>
                        </telerik:OrgChartNode>
                    </Nodes>
                </telerik:OrgChartNode>
            </Nodes>
        </telerik:OrgChartNode>
    </Nodes>
</telerik:RadOrgChart>

I use Q3 2011, also when I want to run my code, I should remove Collapsed="true", I think it is not supported, and I think it is my problem, how can I solve this problem? how can I have an org chart with collapsable/expandable nodes? I use Q3 2011, is it possible at all? I've included only Telerik.Web.UI dll, do I need anything else? any css? Js?

thanks and merry Christmas!!!

[Peter Filipov]

Hi Ali,

You need to upgrade to a newer version of RadControls in order to use expand/collapse functionality. My advice is to update to the latest version of our control so you could use all of the features of the RadOrgChart control.

Regards,
Peter Filipov
Telerik