页面
<telerik:RadTreeView Margin="8" x:Name="radTreeView" SelectionChanged="radTreeView_SelectionChanged" Loaded="radTreeView_Loaded">
            <telerik:RadTreeViewItem Header="Sport Categories">
                <telerik:RadTreeViewItem Header="Football">
                    <telerik:RadTreeViewItem Header="Futsal"/>
                    <telerik:RadTreeViewItem Header="Soccer"/>
                </telerik:RadTreeViewItem>
                <telerik:RadTreeViewItem Header="Tennis">
                    <telerik:RadTreeViewItem Header="Table Tennis"/>
                </telerik:RadTreeViewItem>
                <telerik:RadTreeViewItem Header="Cycling">
                    <telerik:RadTreeViewItem Header="Road Cycling"/>
                    <telerik:RadTreeViewItem Header="Indoor Cycling"/>
                    <telerik:RadTreeViewItem Header="Mountain Bike"/>
                </telerik:RadTreeViewItem>
            </telerik:RadTreeViewItem>
        </telerik:RadTreeView>
当页面完全载入后执行loaded命令
private void radTreeView_Loaded(object sender, RoutedEventArgs e)
        {
            GetTreeViewItemByPath();
        }
定义GetTreeViewByPath方法的逻辑
private void GetTreeViewItemByPath()
{
   string path = "Sport Categories|Football|Soccer";
   radTreeView.PathSeparator = "|";
   RadTreeViewItem targetItem = radTreeView.GetItemByPath( path );
}
系统会根据定义的路径（path）展开树并找到节点（如图）