Widget Instantiation

• All widget classes should define three methods to for widget instantiation: InitWidgetRec, ConstructWidget and SetBindings.

• InitWidgetRec: initializes the private variables.

  proc tixOnOff:InitWidgetRec {w} {
  
  upvar #0 $w data
  tixChainMethod $w InitWidgetRec
  
  set data(count) 0
  }

• tixChainMethod: calls the method in a superclass.

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