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Connect control to dialog box
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   Syntax: TDialog():DefControl( <oControl> ) --> Nil


   Parameters:

   <oControl>  The control that has to be connected to the current
               dialog box.

   Returns:
   Nil

   Comments:
   This method is used when a control is added to a dialog box that gets
   it's structural information from a resource (either linked to the .EXE
   by RC.EX or stored in a .DLL file).  Before the control is added a check
   is made to see whether or not the ::nID instance variable of <oControl>
   is unique for this dialog box.  If the value of <oControl>:nID is
   already in use a warning will be shown and the control will NOT be added
   to the ::aControls instance variable.