RadPanelBar item not expanding when I set Expand property to true

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I am trying to programmatically expand a radpanelitem, but it does not seem to be working. I can expand it via the UI by clicking, but I would like to expand it from the code behind.

01.<telerik:RadPanelBar ID="rpbHeader" runat="server" Skin="Outlook" Width="100%" ExpandMode="FullExpandedItem" OnPreRender="rpbHeader_PreRender">

02.        <Items>

03.            <telerik:RadPanelItem ID="rpi_Header" runat="server" Owner="rpbHeader" Text="Statement Details">

04.                <ContentTemplate>

05.                    <asp:UpdatePanel ID="UpdatePanel3" runat="server">

06.                        <ContentTemplate>

07.                            <div style="padding-top: 8px;">

08.                            </div>

09.                            <div class="RFSHeader">

10.                                <uc2:ucStatementHeader ID="ucStatementHeader" runat="server" />

11.                            </div>

12.                        </ContentTemplate>

13.                    </asp:UpdatePanel>

14.                </ContentTemplate>

15.            </telerik:RadPanelItem>

16.        </Items>

17.    </telerik:RadPanelBar>

1.protected void Page_PreRender(object sender, EventArgs e)
2.        {
3.            if (sessionInfo.SessionObject().FinData.BankStatement != null)
4.            {
5.                rpi_Header.Expanded = true;
6.            }
7.        }

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I have solved this issue. Turns out my update panel was in the wrong position.

Thanks