oWin:GoNextCtrl( <hCtrl> ) -> <nil>

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 PARAMETER:

   <hCtrl>        hWnd handle of the control from where the search for the 
               next enabled control in this window should start.


 DESCRIPTION:

  This method is normally invoked by oControl:KeyChar() when the user 
  presses the VK_TAB key. It will then set the input focus to the next 
  enabled control of this window, starting from the control identified by 
  <hCtrl>.