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As widget_event , handleevent() and xmanager are written now, there should be only one eventlist, not two (this old feature always worried me). xmanager simply blocks on widget_event by default and the loop does not give back the line command until the blocking widgest is closed. A progressbar using a timer has been introduced in test_widgets: its behaviour is now 100% compatible with IDL ( try to create 2 test_widgets, one non blocking and the next blocking: same behaviour, even the error returned when the blocking widget is closed before the non-blocking one is also observed in IDL)