How do I show a RadPopup programmatically in .NET MAUI

 <Grid>
        <Button x:Name="button"
                HorizontalOptions="Center" 
                VerticalOptions="Start" 
                Command="{Binding OpenPopup}"
                Text="Show popup">
            <telerik:RadPopup.Popup>
                <telerik:RadPopup x:Name="popup"
                                  IsModal="True" IsOpen="{Binding IsPopupOpen}"
                                  OutsideBackgroundColor="#6F000000">
                    <telerik:RadBorder CornerRadius="8" 
                             BackgroundColor="Wheat">
                        <Grid Padding="10"
                    WidthRequest="200"
                    HeightRequest="150">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>
                            <Label Text="Thank you for choosing Telerik UI for .NET MAUI." 
                         LineBreakMode="WordWrap" />
                            <telerik:RadButton Grid.Row="1"
                                               Padding="2"
                                               HorizontalOptions="End"
                                               Text="Close"
                                               Command="{Binding ClosePopup}"/>
                        </Grid>
                    </telerik:RadBorder>
                </telerik:RadPopup>
            </telerik:RadPopup.Popup>
        </Button>
    </Grid>

public partial class MainPage : ContentPage
{
	public MainPage()
	{
            InitializeComponent();
            this.BindingContext = new PopupViewModel();
	}
}

public class PopupViewModel : NotifyPropertyChangedBase
{
	private bool isPopupOpen = false;

	public PopupViewModel() 
	{
		this.OpenPopup = new Command(this.OnOpenPopup);
		this.ClosePopup = new Command(this.OnClosePopup);
	}
   
    public ICommand OpenPopup { private set; get; }

    public ICommand ClosePopup { private set; get; }
    public bool IsPopupOpen
	{ 
		get => this.isPopupOpen;
		set 
		{
			if (this.isPopupOpen != value)
			{
				this.isPopupOpen = value;
				OnPropertyChanged();
			}
		}		
	}
    private void OnOpenPopup()
    {
        this.IsPopupOpen = true;
    }
    private void OnClosePopup()
    {
        this.IsPopupOpen = false;
    }
}