HierarchicalDataTemplate な TreeViewItem にイベントを設定する

gistfile1.xml

<Window x:Class="MktSys.Gui.HierarchicalDataTemplateTreeViewItemEventSettingWindos"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="HierarchicalDataTemplate な TreeViewItem にイベントを設定する" Height="525" Width="300">
    <Grid>
        <TreeView Name="treeView" ItemsSource="{Binding Elements}" VerticalContentAlignment="Stretch">
            <TreeView.ItemContainerStyle>
                <Style TargetType="{x:Type TreeViewItem}">
                    <EventSetter Event="MouseDoubleClick" Handler="treeViewItem_MouseDoubleClick" />
                </Style>
            </TreeView.ItemContainerStyle>
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Children}">
                    <Label Content="{Binding Name}" />
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>
    </Grid>
</Windows>