Between Platform Preview Release 1 and Platform Preview release 2, Microsoft changed the way that JScript functions can access event information. The method described on pages 70-72 has been removed. As a result, this example required modification and now uses the event.property syntax.
Microsoft also changed the sequence in which events fire. As a result, the popup menu functionality has been changed. To make the menu stay visible when the user moves to select an option, the method for hiding the menu has changed. The menu now only disappears when the user clicks on the menu name.