Custom UserDialogs loader in UWP

CustomUserDialogs.cs

public class CustomUserDialogs : UserDialogsImpl
{
    private LoadingDialog _loadingDialog;
    private LoadingDialog LoadingDialog => _loadingDialog ?? (_loadingDialog = new LoadingDialog());
    private IAsyncOperation<ContentDialogResult> _loadingDialogTask;

    public override void ShowLoading(string title, MaskType? maskType)
    {

        if(LoadingDialog.IsEnabled)
            LoadingDialog.Hide();


        _loadingDialogTask = LoadingDialog.ShowAsync();
    }

    public override void HideLoading()
    {
        LoadingDialog.Hide();
    }
}

LoadingDialog.xaml

<ContentDialog x:Name="contentDialog"
    x:Class="FIX_NAMESPACE.LoadingDialog"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:FIX_NAMESPACE"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="#00000000"
    >
    <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
          BorderThickness="0"
          >
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <ProgressRing Grid.Row="0" IsActive="true" Width="100" Height="100"  Foreground="Red"/>
        <TextBlock Grid.Row="1" Text="Loading..." FontSize="22" FontWeight="Bold"  Foreground="White" HorizontalAlignment="Center"/>
    </Grid>
</ContentDialog>

LoadingDialog.xaml.cs

public sealed partial class LoadingDialog : ContentDialog
{
    public LoadingDialog()
    {
        this.InitializeComponent();

        Application.Current.Resources["ContentDialogBorderWidth"] = new Thickness(0);
    }

}

Setup.cs

public class Setup : MvxWindowsSetup
{
    public Setup(Frame rootFrame, string suspensionManagerSessionStateKey = null) : base(rootFrame, suspensionManagerSessionStateKey)
    {
    }

    public Setup(IMvxWindowsFrame rootFrame) : base(rootFrame)
    {
    }

    protected override void InitializePlatformServices()
    {
        base.InitializePlatformServices();

        Mvx.RegisterSingleton<IEmailService>(() => new EmailService());
    }

    protected override IMvxWindowsViewPresenter CreateViewPresenter(IMvxWindowsFrame rootFrame)
    {
        return new MvxWindowsMultiRegionViewPresenter(rootFrame);
    }

    protected override IMvxApplication CreateApp()
    {
        return new Core.App();
    }
}