<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:system="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" Height="350" Width="525">

    <Grid>

        <Grid.Resources>

            <x:Array x:Key="MyContextMenuList" Type="{x:Type system:String}">
                <system:String>Expand</system:String>
                <system:String>Collapse</system:String>
                <system:String>Refresh</system:String>
            </x:Array>

            <ContextMenu x:Key="MyContextMenu">
                <ContextMenu.ItemsSource>
                    <CompositeCollection>
                        <CollectionContainer Collection="{StaticResource MyContextMenuList}"/>
                    </CompositeCollection>
                </ContextMenu.ItemsSource>
                <ContextMenu.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding}"/>
                    </DataTemplate>
                </ContextMenu.ItemTemplate>
            </ContextMenu>

        </Grid.Resources>

        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <TreeView>

            <TreeView.Resources>

                <Style TargetType="TreeViewItem">
                    <Setter Property="ContextMenu" Value="{StaticResource ResourceKey=MyContextMenu}" />
                </Style>

            </TreeView.Resources>

            <TreeViewItem Header="Elemento 1.0.0">
                <TreeViewItem Header="Elemento 1.1.0"/>
                <TreeViewItem Header="Elemento 1.2.0"/>
                <TreeViewItem Header="Elemento 1.3.0">
                    <TreeViewItem Header="Elemento 1.3.1"/>
                    <TreeViewItem Header="Elemento 1.3.2"/>
                </TreeViewItem>
                <TreeViewItem Header="Elemento 1.4.0"/>
            </TreeViewItem>
            <TreeViewItem Header="Elemento 2.0.0"/>
            <TreeViewItem Header="Elemento 3.0.0">
                <TreeViewItem Header="Elemento 3.1.0"/>
                <TreeViewItem Header="Elemento 3.2.0"/>
                <TreeViewItem Header="Elemento 3.3.0"/>
                <TreeViewItem Header="Elemento 3.4.0"/>
                <TreeViewItem Header="Elemento 3.5.0"/>
                <TreeViewItem Header="Elemento 3.6.0"/>
            </TreeViewItem>
            <TextBlock Text="Elemento 4.0.0"/>

        </TreeView>

        <ToolBar Grid.Row="1">
            <ToolBar.ItemsSource>
                <CompositeCollection>
                    <CollectionContainer Collection="{StaticResource MyContextMenuList}"/>
                </CompositeCollection>
            </ToolBar.ItemsSource>
            <ToolBar.ItemTemplate>
                <DataTemplate>
                    <Button Content="{Binding}"/>
                </DataTemplate>
            </ToolBar.ItemTemplate>
        </ToolBar>

    </Grid>

</Window>