如何在Caliburn.Micro WPF中绑定删除到动作？

public class MyViewModel : Screen
{
    private ObservableCollection<string> items;
    public ObservableCollection<string> Items
    {
        get { return items; }
        set
        {
            items = value;
            NotifyOfPropertyChange(() => Items);
        }
    }

    public ICommand DeleteCommand { get; private set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<string>();

        DeleteCommand = new RelayCommand(DeleteItem, CanDeleteItem);
    }

    private bool CanDeleteItem(object parameter)
    {
        // 在这里判断是否可以执行删除操作
        return true;
    }

    private void DeleteItem(object parameter)
    {
        // 在这里执行删除操作
        string item = parameter as string;
        Items.Remove(item);
    }
}

<ItemsControl ItemsSource="{Binding Items}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding}" />
                <Button Content="删除" Command="{Binding DataContext.DeleteCommand, RelativeSource={RelativeSource AncestorType=ItemsControl}}"
                        CommandParameter="{Binding}" />
            </StackPanel>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>