请教为啥运行结果弹不出菜单内容

请问为啥运行结果弹不出菜单内容

    <Window x:Class="BdmsPlatform.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Name="frmMainWindow" Height="600" Width="800">

    <Grid Name="grdMain">

        <Grid.RowDefinitions>

            <RowDefinition Name="grdRow0" Height="30"></RowDefinition>

            <RowDefinition Name="grdRow1" Height="*"></RowDefinition>

        </Grid.RowDefinitions>

        <Menu HorizontalAlignment="Right" Name="menuMain" 

              Height="{Binding  ElementName=grdRow0, Path=Height}" 

              Grid.Row="0" Grid.Column="0" 

              Width="{Binding ElementName=frmMainWindow, Path=Width}"

               Margin="0,0,-8,0"

              >

            <Menu.ItemTemplate>

                <DataTemplate>

                    <MenuItem  ItemsSource="{Binding Path=Items}" Height="{Binding ElementName=menuMain,Path=Height}" FontSize="15" 

                                      Header="{Binding Path=Title}">

                        <MenuItem.ItemTemplate>

                            <DataTemplate>

                                <MenuItem Height="{Binding ElementName=menuMain,Path=Height}" FontSize="15" 

                                      Header="{Binding Path=Title}">

                                </MenuItem>

                            </DataTemplate>

                        </MenuItem.ItemTemplate>

                    </MenuItem>

                </DataTemplate>

            </Menu.ItemTemplate>

        </Menu>

    </Grid>

</Window>

 public partial class MainWindow : Window

    {

      //  public BdmsInterface.MenuItem[] menus { get; set; }


        public MainWindow()

        {

            InitializeComponent();


            BdmsInterface.MenuItem[] menus = new BdmsInterface.MenuItem[]{

                new BdmsInterface.MenuItem("系统","S"),

                new BdmsInterface. MenuItem("项目","X"),

                new BdmsInterface.MenuItem("工具","T")

            };


            menus[0].Items.Add(new BdmsInterface.MenuItem("退出", "X"));


            this.menuMain.ItemsSource = menus;