MGH_GUI_PICKOBJ__DEFINE Class
     MGH_GUI_PickObj Purpose
  
   This class implements a widget that allows the user to select from a list of objects.
Category
              Widgets.
    WARNING: 
  
   The MGH_OBJ_STRING function is called to generate the string 
  
   values for the list widget.  This can be very slow if the 
  
   SHOW_NAME or SHOW_TITLE keyword is set and the list of candidates
  
   includes objects that do not support a GetProperty method. It is
  
   unwise to set SHOW_NAME or SHOW_TITLE without filtering the list
      of candidates, or otherwise ensuring that they all support the
      required property. 
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    This software is provided subject to the following conditions:
    1.  NIWA makes no representations or warranties regarding the 
    
     accuracy of the software, the use to which the software may 
    
     be put or the results to be obtained from the use of the 
    
     software.  Accordingly NIWA accepts no liability for any loss 
    
     or damage (whether direct of indirect) incurred by any person 
          through the use of or reliance on the software.
    2.  NIWA is to be acknowledged as the original author of the 
    
     software where the software is used or presented in any form. 
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Modification History
  
   Mark Hadfield, Jul 2000 
              Written.