XamarinForms Shell navigation with TabBar items of previous page - xamarin.forms

Question

I need to create a "detail" page that when I clicked from my "master" page, on some button, it redirects me to that "detail" page with navigation bar which has back button.
Code for this is as follows:
protected async Task GoToPage(string route)
{
await Shell.Current.GoToAsync(route);
}
Question is: how to preserve downtab from my previous master page, to show as well as on my detail page?
design is look like this:
https://i.imgur.com/tBqHhH8.png
I only have navigation bar.
In my AppShell.xaml I defined TabBar section for my "master" page ("master" page is first in my tabbar menu).
Should I create separate TabBar for my "detail" page and somehow to insert navigation bar?

Answer 1

You can put your Page to the MenuItem tab.
<MenuItem Text="About"
IconImageSource="info.png"
Command="{Binding AboutPageCommand}" />
Background code.
public ICommand AboutPageCommand => new Command(async () => await NavigateToAboytPageAsync());
async Task NavigateToAboytPageAsync()
{
await Shell.Current.GoToAsync($"aboutPage");
Shell.Current.FlyoutIsPresented = false;
}
Register the page in the App.xaml.cs
Routing.RegisterRoute("aboutPage", typeof(AboutPage));

Answer 2

There is a property called IsTabStop you can set in the Tab tag which can preserve downtab from your previous master page:
IsTabStop, of type bool, indicates whether a Tab is included in tab
navigation. Its default value is true, and when its value is false the
Tab is ignored by the tab-navigation infrastructure, irrespective if a
TabIndex is set.
You can set it to false at specific tab to keep downtab at that tab.
Code example:
<!-- Your Pages -->
<TabBar>
<Tab Title="Master" Icon="tab_feed.png" IsTabStop="False">
<ShellContent ContentTemplate="{DataTemplate local:ItemsPage}" />
</Tab>
<Tab Title="About" Icon="tab_about.png" >
<ShellContent ContentTemplate="{DataTemplate local:AboutPage}" />
</Tab>
</TabBar>
Here is the document: shell/tabs