UI class lost its member and can't find InitializeComponent in VS2022 Preview 4

[taozuhong]

<?xml version="1.0" encoding="utf-8" ?>
<FlyoutPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Kangaroo.Gui.Workbench"
             xmlns:pages="clr-namespace:Kangaroo.Gui">
  <FlyoutPage.Flyout>
        <x:Arguments>
            <pages:WorkbenchFlyout x:Name="WorkbenchFlyoutPage" />
        </x:Arguments>
    </FlyoutPage.Flyout>
  <FlyoutPage.Detail>
    <NavigationPage>
      <x:Arguments>
        <pages:WorkbenchDetail />
      </x:Arguments>
    </NavigationPage>
  </FlyoutPage.Detail>
</FlyoutPage>

    public partial class Workbench : FlyoutPage
    {
        public Workbench()
        {
            // InitializeComponent();

            this.WorkbenchFlyoutPage.MenuItemsListView.ItemSelected += ListView_ItemSelected;
        }

        private void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var item = e.SelectedItem as WorkbenchFlyoutMenuItem;
            if (item == null)
                return;

            var page = (Page)Activator.CreateInstance(item.TargetType);
            page.Title = item.Title;

            Detail = new NavigationPage(page);
            IsPresented = false;

            this.WorkbenchFlyoutPage.MenuItemsListView.SelectedItem = null;
        }
    }

the XAML page and its class as up, compilation message show error:

1>D:\Codelabs\GitHub\Maui\Kangaroo\Gui\Workbench.xaml.cs(18,18,18,37): error CS1061: 'Workbench' does not contain a definition for 'WorkbenchFlyoutPage' and no accessible extension method 'WorkbenchFlyoutPage' accepting a first argument of type 'Workbench' could be found (are you missing a using directive or an assembly reference?)
1>D:\Codelabs\GitHub\Maui\Kangaroo\Gui\Workbench.xaml.cs(33,18,33,37): error CS1061: 'Workbench' does not contain a definition for 'WorkbenchFlyoutPage' and no accessible extension method 'WorkbenchFlyoutPage' accepting a first argument of type 'Workbench' could be found (are you missing a using directive or an assembly reference?)
1>Done building project "Kangaroo.csproj" -- FAILED.

Context: VS2022 Preview 4 (MAUI + WinUI3)

it's a bug or invalid usage?
anybody could give me a hand to solve this issue, thanks in advanced.

[taozuhong]

the root issue is the Content page template in VS2022 Preview 4 (MAUI + WinUI3) marked as Embedded resource while creating.

change the build action to MauiXaml should be OK.