This class inherits from the TWINDOW class, so a dialog box in FiveWin
  is a " Window + ". Any of this methods adds new functionality to the 
  window class or replaces and changes old functionality, therefore
  OOP is often called 'programming the difference' - only new
  bahaviour ( differences ) has to be programmed.
  
  Dialog boxes are normally developed with a resource editor and then 
  'defined' in FiveWin. This is typically done by using the
  DEFINE DIALOG .. command.
  
  You should avoid to create the  dialog object manually via 
  TDIALOG():NEW( .. ), because this constructor has a lot of 
  parameters and it is quite easy to make mistakes !