Hello,You can use the property DataSourceID and set XmlDataSource.
Please take a look at the code below: <ignav:UltraWebTree ID="UltraWebTree1" runat="server" DataSourceID="XmlDataSource1"> </ignav:UltraWebTree> <asp:XmlDataSource ID="XmlDataSource1" runat="server" DataFile="~/SampleXML.xml"></asp:XmlDataSource>
Hope this helps.