>I know. But I would like to know if I should call DODEFAULT() in INIT method of the Class B before calling method MYMETHOD1() of Class A. Ideally I would like to call MYMETHOD1() in the INIT method of the Class A so that any class that inherits from class A automatically calls this method.

Yes, just add this.MyMethod1() in the parent class Init method and class B will inherit it.

Just in case you may add a property to your parent class to be able to prevent this method call in ClassB, so in classA you would have in Init

if thisform.lOkToInitialize
   thisform.MyMethod1()
endif

and in classB Init you would have in Init

if Dodefault()
  more code
else
  return f.
endif