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All the mega-widget classes in Tix, such as TixComboBox and
  TixControl, are implemented in the Tix Intrinsics framework. Also,
  you can write new 
widget classes with the Tix Intrinsics. In
  the next section, I'll go through all the steps of creating a new
  widget class in Tix. I'll illustrate the idea using a new class
  ``TixArrowButton'' as an example. TixArrowButton is essentially a
  button that can display an arrow in one of the for directions
  (see figure 6-1).
   
   Once you have defined your classes, you can create 
widget
  instances
 of these classes. For example, the following code will
  create four instances of your new TixArrowButton class:
  tixArrowButton .up    -direction ntixArrowButton .left  -direction e
tixArrowButton .right -direction w
tixArrowButton .down  -direction s
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