VMTreeView:NotificationObject

 public class VMTreeView:NotificationObject
    {
        public ObservableCollection<OneNode> OneNodeList { get; set; }

        public VMTreeView()
        {
            OneNodeList = new ObservableCollection<OneNode>();

            ObservableCollection<OneNode> NodeList1 = new ObservableCollection<OneNode>();
            NodeList1.Add(new OneNode { GuoJia = "青岛1" });
            NodeList1.Add(new OneNode { GuoJia = "青岛2" });

            ObservableCollection<OneNode> NodeList2 = new ObservableCollection<OneNode>();
            NodeList2.Add(new OneNode { GuoJia = "菏泽", NodeList = NodeList1 });
            NodeList2.Add(new OneNode { GuoJia = "青岛" });

            ObservableCollection<OneNode> OneNodeList1 = new ObservableCollection<OneNode>();

            OneNodeList1.Add(new OneNode { GuoJia = "山东", NodeList = NodeList2 });
            OneNodeList1.Add(new OneNode { GuoJia = "广东" });

            OneNodeList.Add(new OneNode { GuoJia = "中国", NodeList = OneNodeList1 });
            OneNodeList.Add(new OneNode { GuoJia = "美国", });
           // OneNodeList.Add(new OneNode { GuoJia = "韩国" });

            RaisePropertyChanged(string.Empty);
        }
    }

    public class OneNode
    {
        public string GuoJia { get; set; }

        public ObservableCollection<OneNode> NodeList { get; set; }
    }

<Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="auto"></ColumnDefinition>
            <ColumnDefinition Width="auto"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.Resources>

            <HierarchicalDataTemplate  x:Key="OneNode" ItemsSource="{Binding NodeList}">
                <TextBlock Text="{Binding Path=GuoJia}"/>
            </HierarchicalDataTemplate>

            <HierarchicalDataTemplate x:Key="TwoNode"
                                ItemsSource = "{Binding Path=TwoNodeList}">
                <TextBlock Text="{Binding Path=Name}"/>
            </HierarchicalDataTemplate>

            <XmlDataProvider x:Key="treeData" XPath="*">
                <x:XData>
                    <Items Name="Items" xmlns="">
                        <Item1/>
                        <Item2>
                            <Item22/>
                            <Item12/>
                            <Item13>
                                <Item131/>
                                <Item131/>
                            </Item13>
                        </Item2>
                    </Items>
                </x:XData>
            </XmlDataProvider>
            <HierarchicalDataTemplate ItemsSource="{Binding XPath=child::*}"   x:Key="template">
                <TextBlock Name="textBlock" Text="{Binding Name}"/>
            </HierarchicalDataTemplate>

        </Grid.Resources>

        <TreeView Grid.Column="0">
            <TreeView.Items>
                <TreeViewItem Header="根节点1">
                    <TreeViewItem Header="根节点1.1"></TreeViewItem>
                    <TreeViewItem ItemsSource="{Binding Source={StaticResource OneNode}}" Header="My Soccer Leagues" />
                </TreeViewItem>
                <TreeViewItem Header="根节点2" IsExpanded="True">
                    <TreeViewItem Header="根节点2.1"></TreeViewItem>

                    <TreeViewItem IsExpanded="True" ItemTemplate="{StaticResource OneNode}" ItemsSource="{Binding OneNodeList}" Header="My Soccer Leagues" />
                </TreeViewItem>
            </TreeView.Items>
        </TreeView>

        <TreeView Grid.Column="1" ItemTemplate="{StaticResource template}"
           ItemsSource="{Binding Source={StaticResource treeData}}">
        </TreeView>
    </Grid>

 <Grid>
        <TreeView ItemsSource="{Binding DataSource}" x:Name="trv_Menu" Margin="5">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Image Source="..\..\Resource\Menu.png" Margin="2"/>
                        <TextBlock Text="{Binding Name}" Margin="2"/>
                    </StackPanel>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
            <Event:Interaction.Triggers>
                <Event:EventTrigger EventName="SelectedItemChanged" SourceName="trv_Menu">
                    <GalaCommand:EventToCommand Command="{Binding ShowContentCommand}"
                                               CommandParameter="{Binding ElementName=trv_Menu,Path=SelectedItem}"/>  
                </Event:EventTrigger>
            </Event:Interaction.Triggers>
        </TreeView>
    </Grid>