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 GetNewId        Generates an unique control ID
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   Syntax: GetNewId() --> nId

   Returns:
   The ID for a control that is linked to a window/dialogbox.


   Comments:
   When a control is generated from source code, it needs an unique ID
   (a requirement of MS-Windows <g>). To make sure that all ID's are
   actually unique, this value is stored inside the TControl() method.
   This to be sure that all controls actually get an unique ID.