Hi GabrieleMartino,
If you have handler for the Window’s close event, make sure that it is called from the window and not from an element inside the window. jQuery events are bubble events so an event of inner Element bubbles up to a parent Element unless you catch the event of the inner Element and “return false” in the event handler. As a solution for your scenario, subscribe to the jqxDropDownList’s “close” event and return false in the event handler. That will prevent the Event to bubble up to the Window.
Best Regards,
Peter Stoev
jQWidgets Team
http://www.jqwidgets.com