水平ListView中的UserControl不能垂直填充父视图

我需要水平显示ListView中每个项目的UserControl。它可以用StackPanel完成，但据我所知，StackPanel将包裹，直到内容可以放置。但是我需要垂直地填充父(在这个例子中是ListView)，就像它的Grid有多个ListBoxes。顺便说一下，我的UserControl是这样的:

<UserControl x:Class="ResourceEditor.LanguagePanel"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:resources="clr-namespace:ResourceEditor.Resources"            
         xmlns:viewModel="clr-namespace:ResourceEditor.ViewModel">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*"></RowDefinition>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <DockPanel Grid.Row="1"  LastChildFill="True" DockPanel.Dock="Bottom">
        <CheckBox HorizontalAlignment="Center" VerticalAlignment="Center" DockPanel.Dock="Right" IsChecked="{Binding SortByThis}"></CheckBox>
        <UniformGrid Columns="2" Rows="0">
            <Button Content="{x:Static resources:Strings.Save}" DockPanel.Dock="Left" Command="{Binding SaveCommand}"></Button>
            <Button Content="{x:Static resources:Strings.Reset}" DockPanel.Dock="Left" Command="{Binding ResetCommand}"></Button>
        </UniformGrid>
    </DockPanel>

        <ListBox Grid.Row="0" SelectedItem="{Binding SelectedWord}" ItemsSource="{Binding Words}">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="MouseDoubleClick">
                    <command:EventToCommand Command="{Binding Mode=OneTime, Path=EnableEditingCommand}"
                            PassEventArgsToCommand="False" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
            <ListBox.ItemTemplate>
                <HierarchicalDataTemplate DataType="viewModel:WordNodeVM">
                <TextBox IsEnabled="{Binding DataContext.CanEdit, RelativeSource={RelativeSource AncestorType=UserControl}}" Text="{Binding Name}"></TextBox>
                </HierarchicalDataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
</Grid>

我是这样使用的:

  <ListView Grid.Row="2" ItemsSource="{Binding Languages}">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="Focusable" Value="false"/>
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.ItemsPanel>
            <ItemsPanelTemplate>
                <UniformGrid Rows="1" Columns="{Binding Languages.Count}">
                </UniformGrid>
            </ItemsPanelTemplate>
        </ListView.ItemsPanel>
        <ListView.ItemTemplate>
            <HierarchicalDataTemplate DataType="{ x:Type viewModel:LanguagePanelViewModel}">
                <resourceEditor:LanguagePanel DataContext="{Binding}"></resourceEditor:LanguagePanel>
            </HierarchicalDataTemplate>
        </ListView.ItemTemplate>
    </ListView>

我尝试了所有可能的解决方案，改变容器，使用对齐，内容对齐，但不能让我的用户控制填充垂直空间。首先我认为这是UserControl的问题，因为它的行为像StackPanel也许，但它不是。

 public MainWindow()
    {
        var model=new MainViewModel(loadGrid);
        DataContext = model;
        InitializeComponent();
        Closing += (s, e) => ViewModelLocator.Cleanup();
    }
    void loadGrid(IList<LanguagePanelViewModel> panels)
    {
        if (panels == null || !panels.Any())
            return;
        for (int i = 0; i < panels.Count; i++)
        {
            mainGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star)});
            var panel = new LanguagePanel { DataContext = panels[i] };
            Grid.SetColumn(panel, i);
            mainGrid.Children.Add(panel);
        }
    }