DialogHost close automatically after asynchronous call

[DSBRBrasil]

Hi Guys !
I've searched about how to close automatically this control and I couldn't see anything about this, and than I want to explain my approach.

step 1: create a user control

<UserControl x:Class="Dsbr.DeskTop.Views.Shared.UserDialogMessage"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Dsbr.DeskTop.Views.Shared"
             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
             mc:Ignorable="d" 
             Height="150" Width="400">
    <materialDesign:Card  
            Padding="8"
            UniformCornerRadius="6">
        <StackPanel>
            <TextBlock
                    HorizontalAlignment="Center"
                    Margin="0,20,0,0"
                    Name="txtTitle"
                    Style="{StaticResource MaterialDesignHeadline6TextBlock}"
                    Text="Informe um valor" />
            <TextBlock
                HorizontalAlignment="Center"
                Margin="0,20,0,0"
                Name="txtMessage"
                Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
                Text="Informe um valor" />
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="30,0">
                <ProgressBar
                    Height="20"
                    Width="20" 
                    Name="progress"
                    BorderThickness="6"
                    Style="{StaticResource MaterialDesignCircularProgressBar}"
                    Value="45"
                    IsIndeterminate="True" >
                    <ProgressBar.LayoutTransform>
                        <ScaleTransform CenterX="0.5" CenterY="0.5" ScaleX="2" ScaleY="2" />
                    </ProgressBar.LayoutTransform>
                </ProgressBar>
            </StackPanel>
        </StackPanel>
    </materialDesign:Card>
</UserControl>

step 2: in code-behind we need this code

public UserDialogMessage(string title,string message,bool progressVisibility )
        {
            InitializeComponent();
            txtTitle.Text = title;
            txtMessage.Text = message;
            progress.Visibility = progressVisibility?Visibility.Visible:Visibility.Hidden;
        }

step 3: add dialoghost control in mainwindow

<Window>
            <Grid>            
      <materialDesign:DialogHost Identifier="RootDialog" Grid.Column="1"></materialDesign:DialogHost>        
    </Grid>     
</Window>

step 4: add code behind in mainwindow

private async void ExtendedOpenedEventHandler(object sender, DialogOpenedEventArgs eventargs)
        {
            await  Task.Delay(TimeSpan.FromSeconds(3)) //here simulate a asynchronous call
                    .ContinueWith(async (tsk, _)  =>{
                                var g = (DialogHost)sender;
                                g.Dispatcher.Invoke(() =>{g.IsOpen = false;});//close first dialog host

                            },TaskScheduler.FromCurrentSynchronizationContext());     

            var dialogContent = new UserDialogMessage("Ok", "Concluido com sucesso!",false);
            await DialogHost.Show(dialogContent, "RootDialog", async (object sender2, DialogOpenedEventArgs eventargs2) =>
             {
                 await Task.Delay(TimeSpan.FromSeconds(5)) //here, we have 5 sec to finish the second dialog host
                         .ContinueWith( (tsk, _) =>{
                                     var g = (DialogHost)sender2;
                                     g.Dispatcher.Invoke(() =>{g.IsOpen = false;});

                                 },
                                 TaskScheduler.FromCurrentSynchronizationContext());
             });

             
        }

        private async void StatusSefaz_Click(object sender, RoutedEventArgs e)
        {
            var dialogContent = new UserDialogMessage("Verificando disponibilidade da SEFAZ", "Aguarde...",true);
            await DialogHost.Show(dialogContent, "RootDialog",  ExtendedOpenedEventHandler);

        }

And than Voila!

After 5 seconds

and this last windows close automatically