How to Change the Selection Shape in the .NET MAUI Calendar (SfCalendar)?

<ContentPage.Behaviors>
    <local:CalendarBehavior />
</ContentPage.Behaviors>
<ContentPage.Content>
    <Grid RowDefinitions="0.1*, 0.9*">
        <Button x:Name="selectionShapeButton"
                HorizontalOptions="Center"
                VerticalOptions="Center" />
        <calendar:SfCalendar Grid.Row="1"
                             x:Name="calendar" />
    </Grid>
</ContentPage.Content>

public class CalendarBehavior : Behavior<ContentPage>
{
    private SfCalendar calendar;
    private Button selectionShapeButton;
 
    protected override void OnAttachedTo(ContentPage bindable)
    {
        base.OnAttachedTo(bindable);
        this.calendar = bindable.FindByName<SfCalendar>("calendar");
        this.selectionShapeButton = bindable.FindByName<Button>("selectionShapeButton");
        this.selectionShapeButton.Text = "SelectionShape: " + this.calendar.SelectionShape.ToString();
        this.selectionShapeButton.Clicked += SelectionShapeButton_Clicked;
    }
 
    private void SelectionShapeButton_Clicked(object sender, EventArgs e)
    {
        if (this.calendar.SelectionShape == CalendarSelectionShape.Circle)
        {
            this.calendar.SelectionShape = CalendarSelectionShape.Rectangle;
            this.selectionShapeButton.Text = "SelectionShape: " + this.calendar.SelectionShape.ToString();
        }
        else
        {
            this.calendar.SelectionShape = CalendarSelectionShape.Circle;
            this.selectionShapeButton.Text = "SelectionShape: " + this.calendar.SelectionShape.ToString();
        }
    }
 
    protected override void OnDetachingFrom(ContentPage bindable)
    {
        base.OnDetachingFrom(bindable);
        if (this.selectionShapeButton != null)
        {
            this.selectionShapeButton.Clicked -= SelectionShapeButton_Clicked;
        }
 
        this.selectionShapeButton = null;
        this.calendar = null;
    }
}