我有一个问题，我没有NavigationBar在我的页面上，这只是发生后，我实现了标签页在.NET MAUI与棱镜MVVM框架。任何帮助是非常感谢。
显示的所有页面及其视图模型都已注册为服务。

标签页导航代码：

await _navigationService.NavigateAsync($"{nameof(HomePage)}?{KnownNavigationParameters.SelectedTab}={nameof(DashboardPage)}");

标签页：

<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage
    x:Class="TestApp.Views.HomePage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:android="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific;assembly=Microsoft.Maui.Controls"
    xmlns:local="clr-namespace:TestApp.Views;assembly=TestApp"
    android:TabbedPage.ToolbarPlacement="Bottom"
    AutomationId="home_page">

    <local:DashboardPage x:Name="dashboardPage" Title="Home" IconImageSource="icon_home_o" />
    <local:CommentListPage x:Name="commentListPage" Title="Comments" IconImageSource="icon_comment_o" />
    <local:MorePage x:Name="morePage" Title="More" IconImageSource="icon_ellipsis_o" />
</TabbedPage>

Dashboard页面视图模型（代码导航到另一个新视图）：

//When the navigation happens, this page has NO navigation bar and this NO BACK BUTTON which is a problem
await _navigationService.NavigateAsync(nameof(TestListPage))

TestListPage初始化：

public partial class TestListPage : ContentPage
{
    public TestListPage()
    {
        InitializeComponent();
        //nav stack has a count of 0
        var test = Navigation.NavigationStack;
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        //nav stack has a count of 0
        var test = Navigation.NavigationStack;
    }
}