すでにバインドされているオブジェクトのプロパティであるオブジェクトのプロパティをバインドするにはどうすればよいですか？

すでに別のオブジェクトのプロパティであるオブジェクトのプロパティをバインドしようとして問題が発生しました。上のオブジェクトのプロパティをバインドすると、すべて問題ありませんが、1つのプロパティのプロパティをバインドしようとすると、何も表示されません。

これが私のコードです：xaml

    <Window x:Class="WpfTutorialSamples.ListView_control.ListViewColumnSortingSample"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="ListViewColumnSortingSample" Height="200" Width="550">
    <Grid Margin="10">
        <ListView Name="lvUsers">
            <ListView.Resources>
                <Style TargetType="ListViewItem">
                    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                </Style>
            </ListView.Resources>
            <ListView.View>
                <GridView>
                    <GridViewColumn Width="120" DisplayMemberBinding="{Binding Transponder}">
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Transponder" Click="lvUsersColumnHeader_Click">Transponder</GridViewColumnHeader>
                        </GridViewColumn.Header>
                    </GridViewColumn>
                    <GridViewColumn Width="80" DisplayMemberBinding="{Binding Tipo}">
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Tipo" Click="lvUsersColumnHeader_Click">Tipo</GridViewColumnHeader>
                        </GridViewColumn.Header>
                    </GridViewColumn>
                    <GridViewColumn Width="110" DisplayMemberBinding="{Binding Destruida}">
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Destruida" Click="lvUsersColumnHeader_Click">Destruida</GridViewColumnHeader>
                        </GridViewColumn.Header>
                    </GridViewColumn>
                    <GridViewColumn Width="80" >
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Combustible">Combustible</GridViewColumnHeader>
                        </GridViewColumn.Header>
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>

                                <ComboBox  SelectionChanged="ComboBox_StopChanges" DataContext="{Binding Combustible}">
                                    <ComboBox.Resources>
                                        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}">White</SolidColorBrush>
                                    </ComboBox.Resources>

                                    <ComboBox.Items>
                                        <StackPanel Orientation="Horizontal">
                                            <StackPanel>
                                                <StackPanel Name="stckContentLeft">
                                                    <Label BorderBrush="White" BorderThickness="1" Content="Loaded :" FontSize="12" FontWeight="SemiBold" Foreground="Black" Height="25" HorizontalAlignment="Left" Margin="2,2,0,0" VerticalAlignment="Top"  Width="95"/>
                                                    <Label BorderBrush="White" BorderThickness="1" Content="Used :" FontSize="12" FontWeight="SemiBold" Foreground="Black" Height="25" HorizontalAlignment="Left" Margin="2,2,0,0" VerticalAlignment="Top"  Width="95"/>
                                                </StackPanel>
                                            </StackPanel>
                                            <StackPanel>
                                                <StackPanel Name="stckContentRigth">
                                                    <TextBox Name="textBoxLoaded" Height="25" Width="115" MaxLength="3" Margin="2,2,0,0" BorderBrush="Black" BorderThickness="1" FontSize="12" FontWeight="SemiBold" HorizontalAlignment="Left" Text="{Binding Cargado}" VerticalAlignment="Top" />
                                                    <TextBox Name="textBoxUsed" Height="25" Width="115" MaxLength="3" Margin="2,2,0,0" BorderBrush="Black" BorderThickness="1" FontSize="12" FontWeight="SemiBold" HorizontalAlignment="Left" Text="{Binding Usado}" VerticalAlignment="Top" />
                                                </StackPanel>
                                            </StackPanel>
                                        </StackPanel>
                                    </ComboBox.Items>
                                </ComboBox>

                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>
</Window>

そしてc＃コード：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;

namespace WpfTutorialSamples.ListView_control
{
    public partial class ListViewColumnSortingSample : Window
    {
        private GridViewColumnHeader listViewSortCol = null;
        private SortAdorner listViewSortAdorner = null;

        public ListViewColumnSortingSample()
        {
            InitializeComponent();
            List<User> items = new List<User>();
            items.Add(new User() { Transponder = "M001", Tipo = "UH60", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() {Cargado = 4000, Usado = 3000} });
            items.Add(new User() { Transponder = "M002", Tipo = "UH70", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 3000, Usado = 2000 } });
            items.Add(new User() { Transponder = "M003", Tipo = "UH80", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 2000, Usado = 1000 } });
            items.Add(new User() { Transponder = "M004", Tipo = "UH90", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() { Cargado = 1000, Usado = 500 } });
            lvUsers.ItemsSource = items;
        }

        private void lvUsersColumnHeader_Click(object sender, RoutedEventArgs e)
        {
            GridViewColumnHeader column = (sender as GridViewColumnHeader);
            string sortBy = column.Tag.ToString();
            if (listViewSortCol != null)
            {
                AdornerLayer.GetAdornerLayer(listViewSortCol).Remove(listViewSortAdorner);
                lvUsers.Items.SortDescriptions.Clear();
            }

            ListSortDirection newDir = ListSortDirection.Ascending;
            if (listViewSortCol == column && listViewSortAdorner.Direction == newDir)
                newDir = ListSortDirection.Descending;

            listViewSortCol = column;
            listViewSortAdorner = new SortAdorner(listViewSortCol, newDir);
            AdornerLayer.GetAdornerLayer(listViewSortCol).Add(listViewSortAdorner);
            lvUsers.Items.SortDescriptions.Add(new SortDescription(sortBy, newDir));
        }



        private void ComboBox_StopChanges(object sender, SelectionChangedEventArgs e)
        {
            ComboBox snd = sender as ComboBox;
            snd.SelectedIndex = -1;
        }
    }

    public enum Estado_Aeronave { Destruida, Funcional };

    public class Combustible
    {
        public int Cargado { get; set; }
        public int Usado { get; set; }
    }

    public class User
    {
        public string Transponder { get; set; }

        public string Tipo { get; set; }

        public Estado_Aeronave Destruida { get; set; }

        public Combustible combustible { get; set; }
    }

    public class SortAdorner : Adorner
    {
        private static Geometry ascGeometry =
                Geometry.Parse("M 0 4 L 3.5 0 L 7 4 Z");

        private static Geometry descGeometry =
                Geometry.Parse("M 0 0 L 3.5 4 L 7 0 Z");

        public ListSortDirection Direction { get; private set; }

        public SortAdorner(UIElement element, ListSortDirection dir)
            : base(element)
        {
            this.Direction = dir;
        }

        protected override void OnRender(DrawingContext drawingContext)
        {
            base.OnRender(drawingContext);

            if (AdornedElement.RenderSize.Width < 20)
                return;

            TranslateTransform transform = new TranslateTransform
                    (
                            AdornedElement.RenderSize.Width - 15,
                            (AdornedElement.RenderSize.Height - 5) / 2
                    );
            drawingContext.PushTransform(transform);

            Geometry geometry = ascGeometry;
            if (this.Direction == ListSortDirection.Descending)
                geometry = descGeometry;
            drawingContext.DrawGeometry(Brushes.Black, null, geometry);

            drawingContext.Pop();
        }
    }
}

あなたが助けることができれば私はあなたに永遠に感謝するでしょう。

良い一日を。