switch ( parameter )
                {
                    case TouchEventArgs eventArgs:
                        // This is a Touch Event.
                        this.SelectedButtonLabel = "Touch Down in Touch Down Area.";
                    break;
                    case MouseEventArgs eventArgs:
                        // this is a Mouse Event. What we don't know is if it is promoted from a Touch Event or from a "real mouse".
                        if ( eventArgs.StylusDevice == null )
                        {
                            // This is from a mouse, i.e. not promoted from a Touch Event. We ignore it if it was promoted, or we get
                            // two clicks.
                            this.SelectedButtonLabel = "Left Mouse Button Down in Touch Down Area.";
                        }
                    break;
                }