Csharp WPF：基于上下文的标题名称更改在 Tabcontrol 中不起作用，而是在与模板一起使用时为所有选项卡更改

我有一个带有项目标题和内容模板 Select 器的选项卡控件

    <Grid.Resources>
        <DataTemplate x:Key="newTabButtonContentTemplate"/>

        <DataTemplate x:Key="newTabButtonHeaderTemplate">
            <Button Content="Add New Tab" Command="{Binding ElementName=parentUserControl, Path=DataContext.NewCommand}" 
                     HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
            </Button>
        </DataTemplate>

        <DataTemplate x:Key="itemContentTemplate" DataType="{x:Type localNS:ItemViewModel}">
            <views:Ladder DataContext="{Binding ItemLadderViewModel}"/>
        </DataTemplate>

        <DataTemplate x:Key="itemHeaderTemplate" DataType="{x:Type localNS:ItemViewModel}">
            <TextBlock Text="{Binding Header}"/>
        </DataTemplate>

        <templates:TemplateSelector x:Key="headerTemplateSelector"
                       NewButtonTemplate="{StaticResource newTabButtonHeaderTemplate}"
                       ItemTemplate="{StaticResource itemHeaderTemplate}"/>

        <templates:TemplateSelector x:Key="contentTemplateSelector"
                        NewButtonTemplate="{StaticResource newTabButtonContentTemplate}"
                        ItemTemplate="{StaticResource itemContentTemplate}"/>
    </Grid.Resources>
    

视图模型

MainWindowViewModel

    public MainWindowViewModel()
    {
        this.newCommand = new CustomDelegateCommand(
                () =>
                {
                    var itemViewModel = new ItemViewModel(); 
                    Items.Add(itemViewModel);
                    this.CurrentSelectedItem = itemViewModel;
                }
            );
    }

    private ObservableCollection<ItemViewModel> items;
    public ObservableCollection<ItemViewModel> Items
    {
        get
        {
            if (items == null)
            {
                items = new ObservableCollection<ItemViewModel>();
                var itemViewModel = new ItemViewModel();
                Items.Add(itemViewModel);
                this.CurrentSelectedItem = itemViewModel;
                var itemsView = (IEditableCollectionView)CollectionViewSource.GetDefaultView(items);
                itemsView.NewItemPlaceholderPosition = NewItemPlaceholderPosition.AtEnd;
            }

            return items;
        }
    }

    public ItemViewModel CurrentSelectedItem
    {
        get { return this.currentSelectedItem; }
        set
        {
            this.currentSelectedItem = value;
            this.OnPropertyChanged();
        }
    }

ItemViewModel

public class ItemViewModel : BindableBase
{
    private string header = "New Tab";
    private LadderViewModel itemLadderViewModel;

    public ItemViewModel()
    {
        itemLadderViewModel = new LadderViewModel();
        Messenger.Default.Register<Instrument>(this, "InstrumentChanged", instrument =>
        {
            this.Header = instrument.FullName;
        });
    }

    public LadderViewModel ItemLadderViewModel
    {
        get { return itemLadderViewModel; }
    }

    public string Header
    {
        get { return header; }
        set
        {
            header = value;
            OnPropertyChanged();
        }
    }
}

usercontrol有一个包含条目的组合框，如果 Select 了任何条目，则应使用该选定条目更改选项卡标题.我使用gala messenger在对象之间传递消息，因此当 Select combobox时，消息会被发送，并且标头会相应地更改，这也可以工作，但是

The problem is:它更改了所有选项卡的标题，我希望只有在该选项卡中 Select 了组合框项时才能更改选项卡的标题.

public class LadderViewModel : BindableBase
{
    private Instrument ladderInstrumentName = null;

    public Instrument LadderInstrumentName
    {
        get
        {
            return this.ladderInstrumentName;
        }
        set
        {
            this.ladderInstrumentName = value;
            Messenger.Default.Send<Instrument>(value, "InstrumentChanged");
        }
    }
}

我想知道这是否是正确的做法，如果是，问题是什么，如果不是，那么什么是正确的做法.

谢谢