The purpose of this utility routine is to intercept the event
callbacks from widgets and pass the "event" on to an object
EventHandler method. The EventHandler method must be written
with one positional parameter: the event structure that comes
from the widget. Note that the "name" of the object is added
as a field in every event structure.
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This routine is called by the IDL system, not by a user.
Written by: David Burridge, 13th March 2003.
Added EVENT_NAME field to each event object, which contains the name of the widget event. 6 Feb 2004, DWF.
Made a change in which the Event_Method is retrieved from the object causing the event, rather
than from the event object itself. 19 July 2004. DWF.
Removed reference to TOP_OBJECT. 22 January 2005. DWF.