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progress indicator in ultrawebtree

Hi, I am using ultrawebtree control in my page of infragistics version 8.2.I am loading nodes from database on page load. On treenode expand i am again populating child treenodes from database.I want to show loading image icon on following cases 1) node expand 2) When first time tree is loading. I have tried it using updateprogress but its not showing waiting icon or text .How to achieve it. my aspx page contains following code.

                    <div id="MyTreeDiv" style="position: absolute; left: 0px; right: 0px; top: 50px;
                        overflow: auto; bottom: 40px; width: 100%">
                        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" RenderMode="Inline">
                                <script type="text/javascript">
                                <asp:Panel ID="pnl" runat="server" Visible="true" Width="100%">
                                    <ignav:UltraWebTree ID="TreeView1" runat="server" EnableAppStyling="False" EnableViewState="true" LoadOnDemand="Manual"
                                        Selectable="true" CssClass="featureTree" Style="cursor: pointer;
                                        overflow: visible; display: block; position: absolute; height: 100%; top: 0px;
                                        width: auto; bottom: 5px;" EnableTheming="false" Visible="true" AutoPostBack="false"
                                        ClientIDMode="Static" WebTreeTarget="ClassicTree" OnNodeClicked="TreeView1_NodeClicked"
                                        <%--<ClientSideEvents NodeExpand="OnExpandClick(event);" />--%>
                                        <%--<ClientSideEvents InitializeTree="func_initializeTree" DemandLoad="func_demandLoad" />--%>
                                <asp:AsyncPostBackTrigger ControlID="TreeView1" EventName="NodeExpanded" />
                                <%--<asp:PostBackTrigger ControlID="TreeView1" />--%>
                                <asp:AsyncPostBackTrigger ControlID="rpsearch" EventName="ItemCommand" />
                        <asp:UpdateProgress  AssociatedUpdatePanelID="UpdatePanel1"  runat="server" DisplayAfter="0" DynamicLayout="true">
                            <div style="position: relative; top: 30%; text-align: center;">
                                <img src="../icons/Loader.gif" style="vertical-align: middle" alt="Processing" height="50px" />

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