DialogService does not show dialogs view in modal page (Xamarin.Forms)

[Adyvan]

DialogService does not show dialogs view if right now visible some modal page:

In Application class (App.xaml.cs):

await NavigationService.NavigateAsync($"{nameof(NavigationPage)}/{nameof(SomeContentPage)}");

in SomeContentPageViewModel

        private INavigationService navigationService { get; private set; }
        public Command OpenModalPage { get; set; }
        public SomeContentPageViewModel(INavigationService navigationService)
        {
            this.navigationService = navigationService;
            OpenModalPage = new Command(NavigateToModalPage);
        }

        private void NavigateToModalPage()
        {
             navigationService.NavigateAsync($"{nameof(SomeModalContentPage)}", useModalNavigation: true);
        }

in SomeModalContentPageViewModel

           private readonly IDialogService dialogService;
           public SomeModalContentPageViewModel(IDialogService dialogService)
        {
            this.dialogService = dialogService;
        }
.....
            dialogService.ShowDialog("DialogView", new DialogParameters
           {
               {"message" , message },
               {"backgroundColor", Color.FromHex("#D0021B") }
           });
....

also have DialogView.xaml

<?xml version="1.0" encoding="UTF-8"?>
<Frame xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:prism="http://prismlibrary.com"
             x:Class="Test.Forms.Views.DialogViews.DialogView"
             prism:DialogLayout.RelativeWidthRequest="1"
             prism:DialogLayout.CloseOnBackgroundTapped="{Binding CloseOnTap}">
    <StackLayout>
         <Label Text="{Binding Message}"
                HorizontalTextAlignment="Center"/>
    </StackLayout>
</Frame>

after execute dialogServic.show dialog in SomeModalContentPageViewModel we don't see dialog view.. actually the dialog view add in SomeContentPage but don't add in SomeModalContentPage

[lock]

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